Cambridge Occupation Farmer; Parliamentarian ; Military commander Religion Puritan ( Independent ) Signature Military service Nickname(s) Old Ironsides Allegiance Roundhead Service/branch Eastern Association (1643–1645) ; New Model Army (1645–1646) Years of service 1643–51 Rank Colonel (1643 – bef. 1644) ; Lieutenant-General of Horse (bef. 1644–45) ; Lieutenant-General of Cavalry (1645–46) Commands Cambridgeshire Ironsides (1643