At the age of criminal responsibility, the minimum age at which the law holds someone capable of committing any crime. This is currently 10 years.'Actual bodily harm' may be a minor assault; a bruise, for example, may be all the injury involved ;so long as it's some actual harm to the body it's enough.Common assault does not require proof of any harm to the body at all or ,strictly, any contact (as a blow that misses may be enough) A blow that lands is, historically, 'a battery', though the two terms are now synonymous and 'assault' covers both..