Regarding the actus reus, there must be an act, it cannot be an omission. This could be by words, actions or both (Constanza; Ireland) and the term ‘apprehend’ means ‘belief’ that the force is capable of being carried out (Lamb), this does not have to be a rational belief as long as it is honestly held. The term ‘immediate’ means ‘imminent’ (Smith v Woking), and the force that the victim apprehends must be unlawful - there will not be an assault if it is consensual, in self defence or the prevention of crime.