 The actus reus is the wound or infliction of grievous bodily harm ( GBH ) . A " wound " is something that breaks all layers of the skin , and must have an external component – internal bleeding , however serious , is not a wound . Serious wounds would also fall under grievous bodily harm , but some qualifying wounds ( a pin prick , for example ) are very minor . Some wounds would therefore not qualify as grievous bodily harm . 
