This officer was apparently leading the 1er chevau-legers-lanciers at Waterloo however Lieutenant-Colonel Guillaume-Felix du Dumanoir appears to have been in command it until a Prussian cannon ball took his head off. Can anyone give me more details of both issues i.e. Dumanoir or Dubessy leading the regiment, and also "a Prussian cannon-ball"? Why Prussian, were his regiment in action against Bluecher?
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As far as I know, Dubessy was never colonel of the 1er régiment de chevau-légers lanciers. He retired from active service on 18 October 1814 as colonel of the 24th Dragoon Regiment. He was reactivated as colonel of the 2nd Dragoon Regiment during the Hundred Days but retired a second time on 29 May 1815 already. François-Joseph Planzeaux followed him as colonel of the regiment. So, Dubessy would not have been present at Waterloo, at all.
Jacquinot became colonel of the 1er régiment de chevau-légers lanciers (from 16 August 1814: 1er régiment de lanciers) on 5 August 1813, and remained so during the First Restoration as well as during the Hundred Days. He was the regiment's colonel at Waterloo.