As it seems that Cuirassiers are very much a theme here at the moment thought i'd throw into battle a few French heavies against their Russian counterparts.
In the heat of battle i am sure there was many an incident of friend killing friend. Perhaps not so often heavy cavalry, but taking into account the infinite variety of hussar uniforms i feel sure hussar compatriots must have suffered losses at the hands of their own or allied infantry, artillery and maybe even cavalry.