The Grenadier Guards Trooping the Colours, London. DEACCESSIONED AS NOT RELEVEANT TO THE COLLECTION. The Grenadier Guards is an infantry regiment of the British Army. It is the most senior regiment of the Guards Division and, as such, is the most senior regiment of infantry. It is not, however, the most senior regiment of the Army, this position being attributed to The Life Guards. Although The Coldstream Guards were formed before The Grenadier Guards, the regiment is ranked after the Grenadiers in seniority as, having been a regiment of the New Model Army, the Coldstreams served the Crown for four fewer years than the Grenadiers (the Grenadiers having formed as a Royalist regiment in exile in 1656 and the Coldstreams having sworn allegiance to the Crown upon the Restoration in 1660).