On 10 August 1813 the 5th Heavy Cavalry Division was transferred to the V Cavalry Corps and from that day until 5 October Collaert was the acting division commander. During this period, he led the division at the Battle of Dresden on 26–27 August while Lhéritier led the corps. The division included the 2nd, 6th, 11th, 13th and 15th Dragoon Regiments and counted 61 officers and 851 troopers. During the Battle of Leipzig on 16–19 October, Collaert led one brigade in Lhéritier's 1,700-strong 5th Heavy Cavalry Division with Pierre Claude Pajol commanding the corps. Collaert's brigade was made up of four squadrons of the 11th Dragoons, two squadrons of the 13th Dragoons and three squadrons of the 15th Dragoons.