The war of 1812 seems to have wrecked quite a few British military careers in the process. The people in Canada and Great Britain did not look favorably upon Henry Proctor over the slaughter of wounded captives at Frenchtown.
The Americans expected a certain degree of humanity from the Brits so they surrendered their wounded so they would get care. Instead Proctor took his troops and returned to Canada leaving the wounded in the care of the indians who proceeded to slaughter them in their beds.
It naturally enraged the Americans and I’ve read that it drew attention to an area of operations that had been largely ignored and the British were routed.