The flank companies of the first to fourth battalions were detached to form (with detached light companies of British regular battalions) two "ad hoc" light infantry battalions during much of 1813. Part at least of the 1st Light Battalion under Lieutenant Colonel George MacDonnell, which included the light company of the Canadian Fencibles and the light companies of the 2nd and 3rd battalions of Select Embodied Militia, and the main body of the 2nd Battalion of the Select Embodied Militia, also fought at the Battle of Châteauguay. The light battalions were broken up late in 1813 or in early 1814.