Wounding / Grievous Bodily Harm (s.20 & s.18)
The offences of unlawful wounding / inflicting GBH (s.20) and wounding / GBH with intent (s.18), Offences against the Person Act 1861 — the statutory elements reproduced verbatim, mode of trial and maximum sentence for both, and the arrest and search powers, for frontline officers.
Unofficial independent resource — always verify with official sources (College of Policing, your force, PFEW).
Reviewed by BlueLineHub Editorial
What is the difference between s.20 and s.18 wounding / GBH, and what are the maximum sentences?
The s.20/s.18 divide is INTENT: s.20 (unlawful wounding / inflicting GBH) requires no proof of intent to cause GBH, while s.18 (wounding / causing GBH with intent) requires proof that the defendant intended to do GBH, or intended to resist or prevent the lawful apprehension or detainer of any person.
s.20 is triable either way, maximum 5 years' imprisonment. s.18 is indictable-only, maximum life imprisonment. Both figures run through Criminal Justice Act 1948 s.1(1) (which converts the Act's archaic 'penal servitude' wording into imprisonment for the same term) and are confirmed by the CPS Offences against the Person charging standard, since neither section prints the modern figure cleanly on legislation.gov.uk.
Sections 18 and 20 Offences against the Person Act 1861 both criminalise wounding or causing grievous bodily harm (GBH), reproduced verbatim below. The two sections are on this one card because the difference between them is a single element — intent — but that element changes the mode of trial (either way vs indictable-only) and the maximum sentence (5 years vs life). It is educational reference, not a charging decision — verify against current law, CPS charging guidance and force policy.
Offence
ss.18 & 20 Offences against the Person Act 1861
Mode of trial
s.20 (unlawful wounding / inflicting GBH): triable either way. s.18 (wounding / causing GBH with intent): indictable-only.
Maximum sentence
s.20: 5 years' imprisonment (either way). s.18: life imprisonment (indictable-only). Both figures run through the Criminal Justice Act 1948 s.1 (the archaic 'penal servitude' wording in the 1861 Act reads as imprisonment for the same term) and are confirmed by the CPS Offences against the Person charging standard, as neither maximum is printed cleanly on the legislation.gov.uk section text.
Points to prove — statutory elements
Reproduced verbatim from the Act as published on legislation.gov.uk. These are the statutory elements, not a paraphrase — confirm the up-to-date text and any amendments at the source.
(20) Whosoever shall unlawfully and maliciously wound or inflict any grievous bodily harm upon any other person, either with or without any weapon or instrument, shall be guilty of a misdemeanor, and being convicted thereof shall be liable . . . to be kept in penal servitude . . .
(18) Whosoever shall unlawfully and maliciously by any means whatsoever wound or cause any grievous bodily harm to any person, . . . with intent, . . . to do some . . . grievous bodily harm to any person, or with intent to resist or prevent the lawful apprehension or detainer of any person, shall be guilty of felony, and being convicted thereof shall be liable . . . to be kept in penal servitude for life . . .
Powers of arrest & search
A constable may arrest without warrant anyone whom they have reasonable grounds to suspect of committing a s.20 or s.18 offence, where an arrest is necessary on one of the s.24(5) grounds (PACE 1984 s.24).
Code of Practice: PACE Code G — arrest →On arrest away from a police station, PACE 1984 s.32 allows a search of the arrested person for anything that might be evidence of the offence, where there are reasonable grounds.
Code of Practice: PACE Code B — search of premises →CPS charging guidance
Verbatim extracts from the CPS charging guidance (Crown copyright, reproduced under the Open Government Licence v3.0). CPS revises this guidance — confirm against the live page and current law.
The definition of GBH is as above. This offence (section 18 OAPA 1861) however can only be committed where GBH (or wounding) is intended. It bears repeating that the explanation for the charge selection should directly address the question of recklessness or intention, demonstrating how the evidence in the case supports the decision. Evidence of intention may come from different sources, of which the following are a few examples:
selection and use of a particular weapon
severity or duration of attack
making prior threats or planning a serious attack
relevant admissions in interview
If section 20 is a possible alternative verdict to section 18, it is good practice for it to appear on the indictment: Lahaye [2005] EWCA Crim 2847 (and in these circumstances, there should be clear rationale to explain why the prosecution case is that the defendant intended GBH/wounding, why a plea to section 20 is not an acceptable alternative, but that this is a trial issue for the jury to determine).
An offence contrary to section 18 may also be committed where the victim is wounded or caused grievous bodily harm in the course of the defendant resisting or preventing the lawful apprehension of any person. This offence may be used where the injuries amount to grievous bodily harm or injury but where the intention to resist or prevent a lawful apprehension is clearer than the intent to cause a wound or grievous bodily harm.
In the first instance it should be possible to determine whether the injury is of GBH, ABH or battery level.
This must be considered with reference to the victim, i.e. the person’s age, health or any other relevant factors. In Bollom [2003] EWCA Crim 2846 the court said ‘To use this case as an example, these injuries on a 6-foot adult in the fullness of health would be less serious than on, for instance, an elderly or unwell person, or someone who was physically or psychiatrically vulnerable or, as here, on a very young child. In deciding whether injuries are grievous, an assessment must be made of, amongst other things, the effect of the harm on the individual. We have no doubt that in determining the gravity of these injuries, it was necessary to consider them in their real context.’
Examples where the injury is most likely to amount to common assault or battery include (this is not an exhaustive list):
grazes
scratching
abrasions
minor bruising
swelling
reddening of the skin
superficial cuts
Examples where the injury is most likely to amount to ABH as it is more than transient or trifling include (this not an exhaustive list):
damaged teeth or bones
extensive or severe bruising
cuts requiring suturing
loss of consciousness
Examples where the injury is most likely to amount to GBH or more include (this not an exhaustive list):
life changing injuries
significant or sustained medical treatment is required (for instance, intensive care or a blood transfusion) even if full or relatively full recovery follows.
In relation to GBH, prosecutors should also assess the evidence of intention to cause GBH.
A clear focus is required at this first stage on whether the relevant legal tests are made out: are the injuries more than transient or trifling? Are they really serious? For GBH, is there evidence of intention or recklessness? See above for the considerations as to intention.
As a matter of law, prosecutors must prove that the level of injury inflicted amounts to the specific offence charged. However, once the available charges have been identified the level of injury alone may not be determinative of the most appropriate charge considering the specific circumstances on a case-by-case basis.
- The s.20/s.18 divide is INTENT: s.18 requires an intent to do GBH, or an intent to resist or prevent the lawful apprehension or detainer of any person; s.20 does not. On the meaning of 'wound', settled case law (C (a minor) v Eisenhower [1984]) requires a break of the whole skin (both layers of the skin) — bruising or internal bleeding alone is not a wound, though it may still amount to GBH.
- The maximum jumps from 5 years (s.20) to life (s.18), and the mode from either-way to indictable-only, so correctly identifying the intent element is critical before charging or advising on either offence.
- s.18 has its own, separate Sentencing Council guideline — 'causing grievous bodily harm with intent / wounding with intent' — distinct from the s.20 guideline linked above.
Related reading
Primary sources
BlueLineHub is independent and unofficial. Always verify with the authoritative source below.
- Verify on official source
Offences against the Person Act 1861, section 20 — unlawful wounding / inflicting GBH
The offence of unlawfully and maliciously wounding or inflicting grievous bodily harm on another person, either with or without a weapon or instrument.
Last checked: August 2026 - Verify on official source
Offences against the Person Act 1861, section 18 — wounding / GBH with intent
The offence of unlawfully and maliciously wounding or causing grievous bodily harm with intent to do grievous bodily harm, or with intent to resist or prevent the lawful apprehension or detainer of any person.
Last checked: August 2026 - Verify on official source
Criminal Justice Act 1948, section 1 — abolition of penal servitude
Abolished penal servitude and provides that a person liable to penal servitude is instead liable to imprisonment for the same term — the mechanism by which the 1861 Act's 'penal servitude' maxima read as imprisonment today.
Last checked: August 2026 - Verify on official source
CPS Offences against the Person, incorporating the Charging Standard
Confirms the modern maxima and mode of trial for s.20 (5 years, either way) and s.18 (life, indictable-only), since neither figure is printed cleanly on the legislation.gov.uk section text.
Last checked: August 2026 - Verify on official source
Police and Criminal Evidence Act 1984, section 24 — arrest without warrant: constables
The power of arrest without warrant, subject to the necessity criteria in s.24(5).
Last checked: July 2026 - Verify on official source
Police and Criminal Evidence Act 1984, section 32 — search upon arrest
The power to search a person on arrest, away from a police station, for anything that might be evidence relating to the offence.
Last checked: July 2026 - Verify on official source
CPS charging guidance — Offences against the Person (Open Government Licence v3.0)
CPS charging standard for OAPA/assault offences — the level-of-injury charging threshold (verbatim extract shown on this card).
Last checked: August 2026
Frequently asked
- What is the difference between s.20 and s.18 wounding/GBH?
- Intent. s.20 (unlawful wounding / inflicting GBH) does not require proof that the defendant intended to cause GBH. s.18 (wounding / causing GBH with intent) requires proof of an intent to do GBH, or an intent to resist or prevent the lawful apprehension or detainer of any person.
- Is s.20 wounding/GBH triable either way or indictable-only?
- s.20 is triable either way, with a maximum of 5 years' imprisonment. s.18 (wounding/GBH with intent) is indictable-only, with a maximum of life imprisonment.
- Why doesn't the legislation.gov.uk text show a 5-year or life maximum?
- Sections 20 and 18 Offences against the Person Act 1861 still carry the original 'penal servitude' wording. Penal servitude was abolished, and Criminal Justice Act 1948 s.1(1) converts every sentence of penal servitude into imprisonment for the same term — so the modern maxima (5 years for s.20, life for s.18) are confirmed via the CPS Offences against the Person charging standard rather than printed as a number in the section itself.