The Sussex Militia remained embodied during the short Waterloo Campaign of 1815 and were not disembodied until January 1816. After Waterloo there was another long peace. Although officers continued to be commissioned into the militia and ballots were still held, the regiments were rarely assembled for training and the permanent staffs of sergeants and drummers were progressively reduced. From 4 December 1819 Charles Gordon-Lennox, 5th Duke of Richmond was colonel of the Sussex Militia and during his colonelcy the regiment was redesignated as the Sussex Light Infantry Militia in 1835 and as the Royal Sussex Light Infantry Militia (RSLIM) in 1846.