[1] His motives for joining the Parliamentary side against King Charles I are not recorded but his radicalism was evident by 1644 when he testified against his own commander-in-chief, Edward Montagu in favour of Oliver Cromwell.
Was named as a Commissioner at the High Court of Justice for the trial of Charles I and attending no fewer than fourteen of its sittings, but he did not sign the death warrant.
[1] Hammond did not take part in the Cromwellian conquest of Ireland or in the initial invasion of Scotland, but he joined Cromwell at a later date.
[1] After his retirement he was occupied with obtaining pay arrears due to himself and the other personnel of the artillery train that he had commanded.
After the Restoration his name was exempted from the Indemnity and Oblivion Act allowing the state to confiscate the property that had belonged to him.