Notes by Akinchan Aggarwal, Advocate — B.A. (Hons.) Gold Medalist, LL.B. (University Rank 2), LL.M. (Dispute Resolution), UGC–NET, Ph.D. (Pursuing)
In Chapter 1 we established what a tort is and what the plaintiff must prove. This chapter deals with the other side of the record: what the defendant can say once the plaintiff has proved everything.
That is the point students most often miss. A general defence is not an argument that the tort was never committed. It is an argument that assumes the tort was committed — every essential ingredient established — and says that the defendant is nevertheless not liable. Bangia puts it precisely: the defendant may avoid liability "even in such a case".
General defences and specific defences.
Specific defences attach to one tort only — justification, fair comment and privilege exist only in defamation; prescription exists only in nuisance. General defences can be raised against a whole range of torts. Consent can be pleaded to trespass, to defamation, to false imprisonment, to battery. That is why they are collected in one chapter and examined together. In a problem question, always ask the general defences first, because they dispose of the case entirely.
The Eight General Defences at a Glance
| # | Defence | Core idea | Leading authority |
|---|---|---|---|
| 1 | Volenti non fit injuria | The plaintiff freely consented to the harm | Smith v. Baker; Hall v. Brooklands |
| 2 | Plaintiff the wrongdoer | Ex turpi causa non oritur actio — weak in tort | Bird v. Holbrook |
| 3 | Inevitable accident | Neither intended nor avoidable by reasonable care | Stanley v. Powell; Holmes v. Mather |
| 4 | Act of God | Natural forces, extraordinary, no human agency | Nichols v. Marsland |
| 5 | Private defence | Reasonable force to protect person or property | Bird v. Holbrook; Creswell v. Sirl |
| 6 | Mistake | Generally NOT a defence | Consolidated Co. v. Curtis |
| 7 | Necessity | Intentional harm to prevent a greater evil | Cope v. Sharpe; Leigh v. Gladstone |
| 8 | Statutory authority | Legislature authorised the act — complete defence | Vaughan v. Taff Vale Rail Co. |
1. Volenti Non Fit Injuria — The Defence of Consent
The maxim means: to one who is willing, no harm is done. Where a person consents to the infliction of harm upon himself, he has no remedy in tort. As Salmond put it, no man can enforce a right which he has voluntarily waived or abandoned.
Consent may be express or implied.
- Express — you invite someone to your house, so you cannot sue him for trespass. You submit to a surgical operation, so you cannot sue the surgeon for battery. You agree to the publication of matter defamatory of yourself, so you cannot sue for defamation.
- Implied — a cricketer or footballer is deemed to accept the hurt ordinarily incidental to the game. A person using a highway is presumed to accept the risk of pure accidents. A spectator at a cricket match or motor race cannot recover if struck by the ball or an errant car.
The foundational cases
Hall v. Brooklands Auto Racing Club, (1932) 1 K.B. 205 — the plaintiff was a spectator at a motor race on the defendant's track. Two cars collided and one was thrown into the spectators, injuring him. Held: he impliedly took the risk; the danger was inherent in the sport and foreseeable by any spectator. Defendant not liable.
Padmavati v. Dugganaika, 1975 A.C.J. 222 — two strangers took a lift in a jeep. A bolt fixing the front wheel to the axle gave way, the jeep toppled, and both were thrown out; one died. Held: not liable, on two grounds — it was a sheer accident, and the strangers had voluntarily got into the jeep, so volenti applied.
Note this case carefully.
Padmavati appears in Bangia under both volenti non fit injuria and inevitable accident. That is not an error — the court gave two independent reasons. This is exactly the kind of case examiners use to test whether you have read the judgment or only the heading. If asked to illustrate either defence, Padmavati is a correct answer; if asked to distinguish them, use it to show that a single fact situation can attract both.
Wooldridge v. Sumner, (1963) 2 Q.B. 43 — a photographer at a horse show stood at the boundary of the arena. A horse rounded the bend too fast; the frightened plaintiff fell into the course and was seriously injured. Held: the defendants had taken due care and were not liable. The crucial distinction drawn by Diplock L.J. is worth memorising:
"...the duty which he owes is a duty of care, not a duty of skill... A person attending a game or competition takes the risk of any damage caused to him by any act of a participant done in the course of and for the purpose of the game or competition notwithstanding that such act may involve an error of judgment or a lapse of skill, unless the participant's conduct is such as to evince a reckless disregard of the spectator's safety."
Thomas v. Quartermaine, (1887) 18 Q.B.D. 685 — an employee in the defendant's brewery pulled at a stuck lid on a boiling vat; it came off suddenly and he fell back into a cooling vat of scalding liquid. Held (majority, C.A.): the danger was visible, and the plaintiff appreciated and voluntarily encountered it. Defence succeeded.
Illot v. Wilkes, (1820) 3 B. & Ald. 304 — a trespasser who knew of the presence of spring guns could not recover when shot by one. Damage to a trespasser from broken glass or spikes on a wall, or a fierce dog, is likewise not actionable.
The consent must be free
Three things can destroy the reality of consent.
(a) The act must be within the scope of the consent. If a guest invited to sit in the drawing room walks without authority into the bedroom, he is a trespasser. A postman has implied consent to walk up to the point of delivery; beyond that he trespasses.
The Indian illustration is Lakshmi Rajan v. Malar Hospital Ltd., III (1998) C.P.J. 586 (Tamil Nadu SCDRC) — a 40-year-old married woman noticed a painful lump in her breast. The lump had no effect on her uterus, yet during surgery her uterus was removed without justification. Held: deficiency in service. Consent to the operation did not imply consent to removal of the uterus.
(b) Consent obtained by fraud is not real. The law here is subtle, and the two criminal cases Bangia uses must be read together:
| Case | Facts | Result and reason |
|---|---|---|
| R. v. Williams (1923) 1 K.B. 340 |
A music teacher had intercourse with a 16-year-old student under the pretence that it was an operation to improve her voice | Guilty. The mistake went to the very nature of the act. No consent at all. |
| R. v. Clarence (1888) 22 Q.B.D. 23 |
A husband infected his wife with venereal disease, having failed to disclose his condition | Not liable. She knew the nature of the act; she was mistaken only as to its consequences. |
The rule that emerges: fraud vitiates consent only if it induces a mistake as to the real nature of the act, not merely as to its consequences. Bangia notes that a similar rule applies to the tort of battery. The Irish case Hegarty v. Shine, (1878) 14 Cox C.C. 145 held that mere concealment is not such fraud as vitiates consent — the action there also failed on ex turpi causa non oritur actio.
(c) Consent obtained under compulsion is not real. This matters most in the master–servant relationship, where a servant may face a choice between risky work and losing the job. The classic formulation is that of Scott L.J. in Bowater v. Rowley Regis Corporation, (1944) K.B. 476:
"A man cannot be said to be truly willing unless he is in a position to choose freely, and freedom of choice predicates, not only full knowledge of the circumstances on which the exercise of choice is conditional... but the absence of any feeling of constraint so that nothing shall interfere with the freedom of his will."
On the facts, a cart driver was asked by the foreman to drive a horse known to both to be liable to bolt. He protested but obeyed. The horse bolted and injured him. Held: volenti did not apply; he recovered. Goddard L.J. added the practical rule — the maxim "in the case of master and servant is to be applied with extreme caution", and it can "hardly ever be applicable where the act to which the servant is said to be volens arises out of his ordinary duty."
But free choice cuts both ways. Where a workman adopts a risky method of his own free will and not under any compulsion of the employer, the defence is available — Imperial Chemical Industries Ltd. v. Shatwell.
Mere knowledge does not imply assent
This is the single most examined proposition in the chapter. Two things must be proved:
- (i) the plaintiff knew the risk — he was sciens; and
- (ii) knowing it, he agreed to suffer the harm — he was volens.
Knowledge alone is not enough. As Bowen L.J. put it in Thomas v. Quartermaine, the maxim is volenti non fit injuria, not scienti non fit injuria.
Smith v. Baker, (1891) A.C. 325 is the leading authority. The plaintiff worked a drill cutting rock. Stones were conveyed overhead by crane, passing each time above his head. A stone fell and injured him. The employers were negligent in not warning him at the moment of a recurring danger, although he was generally aware of the risk. Held (House of Lords): there was mere knowledge of the risk without assumption of it. Volenti did not apply; the defendants were liable.
Lord Watson framed the correct question, and it is worth quoting because it reframes the whole enquiry:
"The question which has most frequently to be considered is not whether he voluntarily and rashly exposed himself to injury, but whether he agreed that, if injury should befall him, the risk was to be his and not his master's."
Imperial Chemical Industries Ltd. v. Shatwell, (1965) A.C. 656 — two brothers working in the defendant's quarry tested detonators without the requisite precautions, in breach of both statutory provisions and the employer's orders. An explosion injured George Shatwell, who sued the employers on the footing that they were vicariously liable for his brother. It was argued that volenti cannot apply where there is breach of a statutory obligation. Held (House of Lords): the plea was rejected and volenti succeeded. Lord Reid could find no reason why the fact that the brothers had agreed to contravene a statutory prohibition should affect the application of the principle.
Dann v. Hamilton, (1939) 1 K.B. 509 — a lady, knowing the driver was drunk, chose to travel in his car rather than an omnibus. His negligent driving killed him and injured her. Held: volenti rejected; she recovered. The reason is important: the degree of intoxication was not so extreme that taking a lift amounted to consenting to an obvious danger. Asquith J. expressly left open the case where the drunkenness is "so extreme and so glaring" that accepting a lift is like "intermeddling with an unexploded bomb or walking on the edge of an unfenced cliff."
The criticism of Dann v. Hamilton — and why it is a good exam point.
The decision was criticised on the ground that even if volenti did not apply, contributory negligence should have been available. Lord Asquith later explained in a note to the Law Quarterly Review that contributory negligence was not considered because it had not been pleaded. The case was subsequently approved by the Court of Appeal in Slater v. Clay Cross Co. The lesson is procedural and transfers directly to practice: a defence not pleaded is a defence not available.
Negligence of the defendant defeats the defence
The act done must be the same act to which consent was given. When a plaintiff consents to take a risk, the presumption is that the defendant will not be negligent.
If I am injured while hockey is being lawfully played, I cannot complain. If another player negligently or deliberately hits me with a stick, he cannot plead volenti, because I never consented to injury caused in that manner. If I submit to a surgical operation I have no action merely because it is unsuccessful; but if it is unsuccessful because of the surgeon's negligence, I do — what I consented to was not his negligence.
Slater v. Clay Cross Co. Ltd., (1956) 2 Q.B. 264 — the plaintiff was struck by a train while walking along a narrow railway tunnel owned by the defendants. The company knew the public used the tunnel and had instructed drivers to whistle and slow down on entering. The accident happened because the driver ignored those instructions. Held: defendants liable. Denning L.J.: although she voluntarily took the risk of danger from the running of the railway "in the ordinary and accustomed way", she "did not take the risk of negligence by the driver. Her knowledge of the danger is a factor in contributory negligence but is not a bar to the action."
Limitations on the doctrine
(i) Rescue cases
Where the plaintiff voluntarily encounters a risk to rescue somebody from imminent danger created by the defendant's wrongful act, he cannot be met with volenti.
Haynes v. Harwood, (1935) 1 K.B. 146 is the leading authority. The defendants' servant left a two-horse van unattended in a street. A boy threw a stone; the horses bolted, endangering women and children. A police constable on duty in a nearby station managed to stop them and was seriously injured. Held: a rescue case; volenti rejected; defendants liable. Greer L.J. adopted the American rule — the doctrine of assumption of risk does not apply where the plaintiff has, under an exigency caused by the defendant's wrongful misconduct, consciously faced a risk "even of death, to rescue another from imminent danger of personal injury or death, whether the person endangered is one to whom he owes a duty of protection... or is a mere stranger."
Wagner v. International Railway, (1921) 232 N.Y. 176 — the American authority, and the source of the most quoted line in this area. A passenger was thrown from a running car by the railway's negligence. His companion went back in the darkness to search for him, missed his footing and fell from the bridge. Held: railway liable. Cardozo J.:
"Danger invites rescue. The cry of distress is the summons to relief... The wrong that imperils life is a wrong to the imperiled victim; it is a wrong also to the rescuer... The emergency begets the man. The wrongdoer may not have foreseen the coming of a deliverer. He is accountable as if he had."
Baker v. T.E. Hopkins & Son, (1959) 1 W.L.R. 966 — through the employer's negligence a well filled with poisonous fumes from a petrol-driven pump; two workmen were overcome. Dr. Baker was called and told not to enter in view of the risk. He tied a rope round himself and went in anyway. He was overcome, pulled out, and died on the way to hospital. Both workmen had already died. Held: the rescuer's act was the natural and probable consequence of the defendant's wrong, which the defendant could have foreseen. Volenti unavailable; defendants liable.
Hyett v. Great Western Railway Co., (1948) 1 K.B. 345 answers a question examiners like: does the rescue principle extend to rescue of property? The plaintiff was injured trying to save the defendant's railway cars from a fire caused by the defendant's negligence. His conduct was considered reasonable and the defendant was held liable. Yes — it extends to property.
Three further refinements are worth carrying into the exam hall:
- The rescuer's right is independent. It is not derived from the victim's. The victim may have been contributorily negligent, or barred by contract, or a trespasser — the rescuer can still sue. Per Lord Denning M.R. in Videan v. British Transport Commission.
- A person who endangers himself is liable to his rescuer. If A by his own carelessness puts himself in a position of peril "of a kind that invites rescue", he is liable for injury to someone he ought to have foreseen would come to his aid. The rescuer need not be called, and may even be an unwelcome helper — a man who jumps into a well to commit suicide is liable to the person injured while rescuing him. But if the person rescued is not at fault in creating the danger, he cannot be sued.
- Rescue is not novus actus interveniens. The argument that the rescuer's intervention breaks the chain of causation and makes the defendant's negligence a remote cause was raised and rejected in Haynes v. Harwood itself. As Pollock put it, "the law does not think so meanly of mankind" as to treat rescue as anything other than a natural and probable consequence of putting a helpless person in danger.
The limit: where there is no real danger, there is no rescue. In Cutler v. United Dairies (London) Ltd., (1933) 2 K.B. 297, a person injured trying to stop a horse which had caused no danger was left without remedy. He could not be heard to say, "I knew the horse would plunge, but I did not know how much it would plunge."
(ii) The Unfair Contract Terms Act, 1977 (England)
Section 2 of the English Act limits the right to exclude liability for negligence by contract term or notice:
| Provision | Effect |
|---|---|
| Section 2(1) | Absolute ban on excluding liability for death or personal injury resulting from negligence, by contract term or notice |
| Section 2(2) | For other loss or damage, exclusion is possible only if the term or notice satisfies the requirement of reasonableness |
| Section 2(3) | Even where exclusion is permitted, the plaintiff's agreement to or awareness of the term is not of itself voluntary acceptance of risk — something more must be proved |
Section 2(3) is the provision that directly cuts into volenti: it converts what would once have been conclusive evidence of consent into merely one piece of evidence.
Volenti non fit injuria and contributory negligence distinguished
| Basis | Volenti non fit injuria | Contributory negligence |
|---|---|---|
| Effect on claim | Complete defence — the claim fails entirely | Partial — damages reduced in proportion to the plaintiff's fault (Law Reform (Contributory Negligence) Act, 1945) |
| Whose negligence | The plaintiff may be volens while still exercising due care for his own safety. Defendant's negligence may rule the defence out | Both plaintiff and defendant are negligent |
| Knowledge of danger | The plaintiff is always aware of the nature and extent of the danger | May exist in respect of a danger the plaintiff did not in fact know, but ought to have known |
2. Plaintiff the Wrongdoer
The maxim is ex turpi causa non oritur actio — from an immoral cause no action arises. In contract, a person cannot found a cause of action on an unlawful agreement.
In tort, the position is much weaker, and this is the point to make in an answer. Bangia states it as doubtful whether the defendant can escape liability merely by pleading that the plaintiff was, at the relevant time, also doing something wrongful. The principle is that the mere fact that the plaintiff was a wrongdoer does not disentitle him from recovering. He may have to answer for his own wrong, but he does not forfeit his right of action for the harm suffered.
Thus, if a trespasser enters my premises, I cannot inflict unnecessary injuries on him. The trespasser "is liable to an action for the injury which he does: but he does not forfeit his right of an action for injury sustained." In Bird v. Holbrook, (1828) 4 Bing. 628, a trespasser was held entitled to compensation for injury from a spring gun set in the defendant's garden without notice.
Pollock's test — the connection test.
The plaintiff is not disabled from recovering "unless some unlawful act or conduct on his own part is connected with the harm suffered by him as part of the same transaction." So the question is always: what is the connection between the plaintiff's wrong and his harm?
If his own act is the determining cause of the harm, he has no action. If it is independent of the harm, the defence fails.
Bangia's bridge illustration is the cleanest way to remember this. A bridge under the defendant's control gives way as the plaintiff's overloaded truck passes over it.
- If the truck was overloaded contrary to a warning notice, and the bridge would not have given way had it been properly loaded — the plaintiff's wrongful act is the determining cause. His action fails, even if the bridge was in disrepair.
- If the bridge was so ill maintained that it would have given way even with a properly loaded truck — the defendant's wrong is the determining cause. The action succeeds.
Where the wrong is wholly unconnected, the defence is hopeless. Lord Asquith's example from National Coal Board v. England, (1954) A.C. 403 is memorable: if A and B are on their way to commit a burglary and B picks A's pocket before they enter, A can sue in tort — "The theft is totally unconnected with the burglary."
A third possibility exists: the plaintiff's conduct may amount to contributory negligence, in which case he is not disentitled but his compensation is reduced in proportion to his own fault.
3. Inevitable Accident
An accident is an unexpected injury. If it could not have been foreseen and avoided in spite of reasonable care by the defendant, it is an inevitable accident. Pollock's definition is the one to quote:
"It does not mean absolutely inevitable, but it means not avoidable by any such precautions as a reasonable man, doing such an act then and there, could be expected to take."
The defendant must show that he neither intended to injure the plaintiff nor could have avoided the injury by reasonable care.
Where the defence succeeded
| Case | Facts and holding |
|---|---|
| Stanley v. Powell [1891] 1 Q.B. 86 |
Members of a pheasant shooting party. The defendant fired at a pheasant; the shot glanced off an oak tree and injured the plaintiff. Accidental — not liable. |
| Holmes v. Mather (1875) L.R. 10 Ex. 261 |
Horses startled by a barking dog became unmanageable and knocked down the plaintiff despite the servant's best efforts. Not liable. Bramwell B.: people using roads "must expect, or put up with, such mischief as reasonable care on the part of others cannot avoid." |
| Brown v. Kendall (1850) 6 Cush. 292 |
While separating two fighting dogs, the defendant accidentally hit the plaintiff in the eye. Pure accident — no action. |
| Nitro-Glycerine Case (1872) 15 Wallace 524 |
Carriers, not knowing the contents, opened a leaking wooden case in their office; the nitro-glycerine exploded and damaged the plaintiff's building. Not liable — they could not reasonably suspect the contents. |
| National Coal Board v. Evans (1951) 2 K.B. 861 |
Trespass to chattel. Contractors excavating for a county council damaged an electric cable that the plaintiff's predecessors had laid under another's land without knowledge. Not liable — no opportunity to discover it. |
| Assam State Coop. Federation v. Anubha Sinha A.I.R. 2001 Gau. 18 |
A tenant asked the landlord to repair defective electric wiring; the landlord failed to. Accidental fire, probably from a short circuit. No negligence by the tenant. Inevitable accident — tenant not liable. |
| Shridhar Tiwari v. U.P.S.R.T.C. 1987 A.C.J. 636 |
A cyclist came suddenly in front of a bus on a wet road; braking caused a skid and a collision with an oncoming bus. Both buses at moderate speed, due care by both drivers. Inevitable accident — Corporation not liable. |
Where the defence failed — and why this matters more
The defence is available only where the event is unforeseeable and the consequences unavoidable despite reasonable precautions. Where the event can be anticipated and guarded against, the plea collapses.
S. Vedantacharya v. Highways Department of South Arcot, 1987 A.C.J. 783 (Supreme Court) — on 14 November 1960 a culvert gave way as a bus passed over it; the bus plunged into the stream and a passenger died. Negligence was presumed against the Department, which pleaded very heavy rain over the previous fortnight, more than six inches the day before, and the breach of a nearby lake sending water into the culvert with terrible velocity. The Engineers' Report showed the culvert was sound the previous day.
Held (reversing the Madras High Court): failing to make suitable provision for strengthening culverts and bridges against heavy rain and flood which can be anticipated amounts to negligence. The Department could not be absolved merely by claiming heavy rain and flood; it had to prove that preventive measures had been taken anticipating such rain and flood and the accident occurred despite that. It failed to do so, and was held liable.
The mechanical-defect line of cases.
A recurring motor-accident argument is that a sudden mechanical failure was an inevitable accident. It fails unless the defendant proves the defect could not have been detected despite reasonable precautions. Where old and worn-out tyres burst at excessive speed, the plea fails. In Oriental Fire & General Ins. Co. Ltd. v. Raj Rani, 1986 A.C.J. 310, the front right spring and patta of a truck broke suddenly and it dashed against an oncoming tractor; the driver and owner could not prove they had taken reasonable precautions to keep the truck roadworthy. Held: negligence, not inevitable accident. Compare Padmavati v. Dugganaika, where there was no evidence the defect was patent or detectable on periodical check-up — and the plea succeeded. The difference is entirely one of proof.
4. Act of God (Vis Major)
Act of God is a species of inevitable accident, distinguished by its cause: the loss arises out of the working of natural forces — exceptionally heavy rainfall, storms, tempests, tides, volcanic eruptions. It is also a recognised exception to the rule of strict liability in Rylands v. Fletcher.
The definition in Halsbury's Laws of England is the standard one:
"An extraordinary occurrence of circumstance, which could not have been foreseen and which could not have been guarded against, or, more accurately, an accident due to a natural cause, directly and exclusively, without human intervention, and which could not have been avoided by any amount of foresight and pains and care reasonably to be expected... The occurrence need not be unique, nor need it be one that happens for the first time; it is enough that it is extraordinary, and such as could not reasonably be anticipated... and it must not arise from the act of man."
Two essentials:
- (1) There must be working of natural forces; and
- (2) The occurrence must be extraordinary, and not one which could be anticipated and reasonably guarded against.
Essential 1 — working of natural forces
Ramalinga Nadar v. Narayan Reddiar, A.I.R. 1971 Kerala 197 — goods being transported in the defendant's lorry were robbed by an unruly mob. Held: the criminal activities of a mob cannot be an Act of God; the defendant was liable as a common carrier. The Court drew the line clearly:
"Accidents may happen by reason of the play of natural forces or by intervention of human agency or by both. It may be that in either of these cases, accidents may be inevitable. But it is only those acts which can be traced to natural forces and which have nothing to do with the intervention of human agency that could be said to be Acts of God."
Note the structure of that passage: an event may be an inevitable accident without being an Act of God. Human agency defeats the latter but not the former.
Essential 2 — the occurrence must be extraordinary
The two cases here are best learned as a pair, because they are decided on the same principle and reach opposite results.
| Case | The rainfall | Result |
|---|---|---|
| Nichols v. Marsland (1876) 2 Ex. D. 1 |
The defendant had created artificial lakes by damming natural streams. Rainfall "the heaviest in human memory" burst the embankments and washed away four bridges | Defence succeeded — extraordinary and unforeseeable |
| Kallulal v. Hemchand A.I.R. 1958 M.P. 48 |
A building wall collapsed on a day with 2.66 inches of rain, killing the respondent's two children | Defence failed — that much rain in the rainy season was not extraordinary and ought to have been anticipated and guarded against |
The test is comparative, not absolute. The question is never "was there a lot of rain?" but "was this rainfall extraordinary for this place, at this time of year?" That is why 2.66 inches in an Indian monsoon fails where the heaviest rainfall in living memory succeeds.
5. Private Defence
The law permits the use of reasonable force to protect one's person or property. If the defendant uses force necessary for self-defence, he is not liable for the harm caused.
Three conditions govern the plea:
- The threat must be imminent. A is not justified in using force against B merely because he thinks B will attack him some day.
- Force cannot be used by way of retaliation after the attack is already over.
- The force must not be excessive. Only such force as is absolutely necessary to repel the invasion may be used. The old illustration is that "if A strikes B, B cannot justify drawing his sword and cutting off his hand." As one judge put it, the right of self-defence "is one which may be easily abused. The force employed must not be out of proportion to the apparent urgency of the occasion."
Defence of property
Reasonable measures are permitted, but the line is drawn firmly at devices that injure without warning.
| Permitted | Not permitted |
|---|---|
| Fixing broken glass or spikes on a wall | Setting spring guns without notice |
| Keeping a fierce dog | Laying live electric wire without visible warning |
Bird v. Holbrook, (1828) 4 Bing. 628 — the defendant set spring guns in his garden without any notice. A trespasser was seriously injured by an automatic discharge. Held: the plaintiff recovered; the force used was greater than the occasion demanded.
Compare Illot v. Wilkes, discussed earlier, where the trespasser had notice of the spring guns and recovered nothing — that was volenti non fit injuria. The presence or absence of notice is what separates the two cases.
Ramanuja Mudali v. M. Gangan, A.I.R. 1984 Mad. 103 — the Indian authority. A landowner laid live electric wire on his land. The plaintiff, crossing at 10 p.m. to reach his own land, received a shock and was injured. No visible warning had been given. Held: the defendant was liable. (See also Cherubin Gregory v. State of Bihar, A.I.R. 1964 S.C. 205.)
Collins v. Renison, (1754) 1 Sayer 138 — the plaintiff went up a ladder to nail a board to a wall in the defendant's garden. The defendant threw him off. Sued for assault, he pleaded that he had "gently shaken the ladder, which was a low ladder, and gently overturned it, and gently threw the plaintiff on the ground, thereby doing as little damage as possible." Held: the force was not justifiable in defence of possession of land. The threefold "gently" has kept this case in the textbooks for two and a half centuries.
Shooting an animal — the rules in Creswell v. Sirl
In Creswell v. Sirl, (1948) 1 K.B. 241, the defendant shot the plaintiff's dog which was chasing and attacking his sheep and pigs. The Court of Appeal laid down that the onus of proof is on the defendant to justify the shooting by showing:
- (1) that at the time of shooting the dog was either actually attacking the animals in question, or, if it were at large, would renew the attack; and
- (2) that either there was in fact no practical means other than shooting of stopping the present attack or preventing its renewal, or that the defendant, having regard to all the circumstances in which he found himself, acted reasonably in regarding the shooting as necessary.
Note the structure: limb (1) is about the animal's conduct and limb (2) about the necessity of the response, and each limb has two alternatives. It is a well-drafted test and a favourite of examiners precisely because it is easy to state incompletely.
6. Mistake
Mistake, whether of fact or of law, is generally NO defence in tort. This is the proposition to lead with, because it runs against the intuition students bring from criminal law, where mistake of fact is a defence in certain cases.
Where a person wilfully interferes with the rights of another, it is no answer that he honestly believed there was justification when in fact none existed. Thus:
- Entering another's land thinking it is your own is trespass to land.
- Taking away another's umbrella thinking it is your own, or driving the plaintiff's sheep among your own herd, is trespass to goods.
- Injuring another's reputation without any intention to defame is defamation.
Consolidated Co. v. Curtis, (1892) 1 Q.B. 495 — an auctioneer was asked by a customer to auction certain goods. Honestly believing the goods belonged to the customer, he auctioned them and paid over the proceeds. The goods in fact belonged to someone else. Held: in an action by the true owner, the auctioneer was liable for conversion. His honesty was irrelevant.
The exceptions
There are situations where an honest but mistaken belief does assist the defendant — but observe that in most of them, mistake is not operating as a free-standing defence at all. It is negativing an ingredient the plaintiff must prove.
| Situation | Why mistake helps |
|---|---|
| Malicious prosecution | The plaintiff must prove the defendant acted maliciously and without reasonable cause. A genuinely mistaken prosecution of an innocent man is not actionable |
| Vicarious liability | A servant's mistake may put his act outside the course of employment, so the master's vicarious liability never arises |
| Deceit | Honest belief in the truth of the statement is a defence — Derry v. Peek, (1889) 14 A.C. 337 |
Why the general rule is what it is.
The torts where mistake is no defence — trespass, conversion, defamation — are those which protect interests rather than punish conduct. The plaintiff's land, goods and reputation are interfered with just as much whether the defendant was honest or not, and the law places the loss on the person who caused it. The torts where mistake does help — deceit, malicious prosecution — are those whose very definition includes a mental element. State the rule this way in an answer and you will have explained it rather than merely recited it.
7. Necessity
An act causing damage, if done under necessity to prevent a greater evil, is not actionable even though the harm was caused intentionally.
The distinctions here are the most frequently examined comparison in the chapter.
| Basis | Necessity | Private defence | Inevitable accident |
|---|---|---|---|
| Who suffers the harm | An innocent person | The plaintiff, who is himself the wrongdoer | Anyone |
| Was the harm intended? | Yes — intentional | Yes — intentional | No — caused despite best efforts to avoid it |
| Justification | Prevention of a greater evil | Repelling an imminent attack | Absence of fault |
Illustrations of necessity
- Throwing goods overboard to lighten a ship and save the vessel or those on board — Mouse's Case, (1609) 12 Rep. 63.
- Pulling down a house to stop the further spread of fire.
- Pulling a drowning person out of the water.
- A competent surgeon operating on an unconscious person to save his life.
- A master of a ship, as an agent of necessity, selling or hypothecating the ship, or disposing of rapidly perishing cargo, where he had no opportunity of communicating with his principal.
Leigh v. Gladstone, (1909) 26 T.L.R. 139 — the forcible feeding of a hunger-striking prisoner to save her life was held a good defence to an action for battery.
Cope v. Sharpe, [1912] 1 K.B. 496 — the defendant entered the plaintiff's land to prevent the spread of fire to adjoining land over which his master had shooting rights. Held: the act was reasonably necessary to save the game from real and imminent danger; not liable for trespass.
Where necessity fails — the requirement of reasonable necessity
The defence turns entirely on whether the interference was reasonably necessary. Two cases show how easily it is lost.
Carter v. Thomas, [1893] 1 Q.B. 673 — the defendant entered the plaintiff's premises in good faith to extinguish a fire at which the firemen were already working. Held liable for trespass. Good faith is not enough where the intervention was not necessary.
Kirk v. Gregory, (1876) 1 Ex. D. 55 — after A's death, his sister-in-law moved jewellery from the room where he lay dead to another room, thinking it a safer place. From there it was stolen. Held liable in trespass to goods to A's executors, because the interference was not reasonably necessary.
Read Cope v. Sharpe against these two and the principle emerges cleanly: necessity protects the reasonable intervener, not the well-meaning one. The danger must be real and imminent, and the interference must be genuinely required to meet it.
8. Statutory Authority
Damage resulting from an act which the legislature authorises or directs to be done is not actionable, even though it would otherwise be a tort. This is a complete defence, and the injured party has no remedy except such compensation as the statute itself may provide.
Crucially, the immunity extends not only to the obvious harm but also to harm which is incidental to the exercise of the authority. If a railway line is constructed there may be interference with private land; when trains run there may be noise, vibration, smoke and sparks. No action lies for either.
| Case | Facts | Held |
|---|---|---|
| Vaughan v. Taff Vale Rail Co. (1860) 5 H. & N. 679 |
Sparks from an engine of a statutorily authorised railway set fire to the appellant's woods on adjoining land. Proper care had been taken to prevent emission of sparks | Not liable |
| Hammersmith Rail Co. v. Brand (1869) L.R. 4 H.L. 171 |
The plaintiff's property depreciated considerably due to noise, vibration and smoke from trains on a railway constructed under statutory powers | No action — damage necessarily incidental to authorised running |
| Smith v. London and South Western Railway Co. (1870) L.R. 6 C.P. 14 |
Railway servants negligently left grass and hedge trimmings near the line. Sparks set them alight; heavy wind carried the fire to a cottage 200 yards away, which burnt down | Liable — negligence defeats the defence |
Cockburn C.J. stated the principle in Vaughan: where the legislature has sanctioned the use of a particular thing and it is used for the authorised purpose, "the sanction of the legislature carries with it this consequence, that if damage results from the use of such thing... the party using it is not responsible."
But the act authorised must be done carefully. Lord Blackburn's formulation in Geddis v. Proprietors of Bann Reservoir, (1878) 3 A.C. 430, is the sentence to remember: "an action does lie for doing that which the legislature had authorized, if it be done negligently." Smith v. L.S.W. Railway is the illustration.
Absolute and conditional authority
| Absolute authority | Conditional authority |
|---|---|
| The act may be done even though nuisance or other harm necessarily results. No liability | The act may be done only if it is possible without causing nuisance or other harm. The condition may be express or implied |
| Railway Acts are generally construed as conferring absolute authority to set up the railway, whether nuisance is caused or not | Metropolitan Asylum District v. Hill — construed as authority to set up a hospital if that could be done without creating a nuisance |
Metropolitan Asylum District v. Hill, (1881) 6 A.C. 193 — a hospital authority empowered to set up a smallpox hospital erected one in a residential area, creating a danger of infection to residents. Held: a nuisance; an injunction was issued to remove the hospital. The statutory authority was construed as conditional.
The practical question in any problem is therefore: does the statute authorise the activity, or only the activity conducted harmlessly? Where the harm is an inevitable consequence of doing the very thing authorised, the authority is likely absolute. Where the harm arises from the particular manner or place chosen, when other manners or places were open, it is likely conditional.
Comparison Table: The Three Look-Alike Defences
Inevitable accident, Act of God, and volenti are routinely confused. This table resolves them.
| Basis | Inevitable accident | Act of God | Volenti non fit injuria |
|---|---|---|---|
| Cause | Human or natural | Natural forces only, without human intervention | The defendant's act, consented to |
| Plaintiff's state of mind | Irrelevant | Irrelevant | Central — he must be sciens and volens |
| Test | Not avoidable by reasonable care | Extraordinary and not reasonably foreseeable or guardable | Free and informed agreement to bear the risk |
| Defence to strict liability? | No | Yes — recognised exception to Rylands v. Fletcher | Yes — consent of the plaintiff is an exception |
| Relationship | The wider category | A species of inevitable accident | Independent |
Exam Corner
The traps that catch most candidates:
- "Mere knowledge of a risk is consent." It is not. Volenti, not scienti, non fit injuria — Smith v. Baker. This is the most commonly set trap in the entire chapter.
- "Mistake is a defence in tort." Generally it is not. Do not import the criminal law position.
- "Every unforeseen event is an Act of God." Only if it arises from natural forces without human intervention. A mob robbing a lorry is not — Ramalinga Nadar.
- "Heavy rain is always an Act of God." Only if extraordinary for that place and season. 2.66 inches in an Indian monsoon is not — Kallulal v. Hemchand.
- "A trespasser cannot sue." He can, for injuries beyond what was necessary — Bird v. Holbrook. Being a wrongdoer does not forfeit the right of action.
- "Rescue applies only to saving persons." It applies to property too — Hyett v. Great Western Railway.
- "Consent to an operation covers everything done during it." It does not — Lakshmi Rajan v. Malar Hospital.
- "Statutory authority is an absolute shield." Not where the authorised act is done negligently — Smith v. L.S.W. Railway; and not where the authority is conditional — Metropolitan Asylum District v. Hill.
Distinguish-type questions that recur:
- Volenti non fit injuria and contributory negligence
- Necessity and private defence
- Necessity and inevitable accident
- Inevitable accident and Act of God
- Absolute and conditional statutory authority
Quick Revision
- General defences assume the tort is complete and still defeat liability. Eight in number.
- Volenti requires sciens + volens. Knowledge alone is never enough — Smith v. Baker, (1891) A.C. 325.
- Consent must be free: not beyond scope (Lakshmi Rajan), not by fraud going to the nature of the act (R. v. Williams vs R. v. Clarence), not under compulsion (Bowater).
- Consent never extends to the defendant's negligence — Slater v. Clay Cross.
- Rescue cases are an exception: Haynes v. Harwood; Wagner ("Danger invites rescue"); extends to property (Hyett); the rescuer's right is independent.
- Plaintiff the wrongdoer is a weak defence in tort. Apply Pollock's connection test — is the plaintiff's wrong the determining cause of his harm?
- Inevitable accident — neither intended nor avoidable by reasonable care. Fails where the event could be anticipated: S. Vedantacharya.
- Act of God — (1) natural forces, (2) extraordinary. Nichols v. Marsland succeeds; Kallulal fails.
- Private defence — imminent threat, no retaliation, no excessive force. Bird v. Holbrook; Creswell v. Sirl (onus on defendant).
- Mistake — generally no defence. Consolidated Co. v. Curtis. Exceptions: malicious prosecution, deceit, servant's mistake outside employment.
- Necessity — intentional harm to an innocent person to avert a greater evil. Must be reasonably necessary: Cope v. Sharpe succeeds; Carter v. Thomas and Kirk v. Gregory fail.
- Statutory authority — complete defence covering incidental harm, but not negligence (Geddis; Smith v. L.S.W. Rly.), and conditional authority is narrower (Metropolitan Asylum District v. Hill).
Coming Next
Chapter 3 deals with Capacity — who may sue and who may be sued. It covers Act of State, corporations, minors (including pre-natal injuries and the liability of parents), joint, independent and composite tortfeasors with the rules on contribution and indemnity, husband and wife, and persons having parental, quasi-parental, judicial or executive authority.
Disclaimer: These notes are prepared from Chapter 2 (General Defences) of R.K. Bangia, Law of Torts (22nd edition), and are intended for general information and legal education only. They do not constitute legal advice. Case names, citations and statutory references follow the text and should be verified against the law reports and bare statutes before being relied upon or cited in court or in an examination answer, as reported citations occasionally vary between editions and series. English decisions are cited as illustrative of principles received in India and are not binding. Readers requiring advice on a specific matter should consult a qualified advocate. Please read our Disclaimer for more details.
