Gunter, your welcome,
the rest of the officers for the 42nd were
Ensign George Gerard killed at QB
Ensign William Fraser slightly at QB
Ensign A. L. Fraser wounded at QB
Ensign Alexander Brown
Ensign Alexander Cumming
Adjutant James Young slightly at QB
Quartermaster Donald M’Intosh slightly at Waterloo
Surgeon Swinton M’Leod
Assistant Surgeon Donald M’Pherson
Assistant Surgeon John Stewart
Interestingly, John Campbell's letter to Siborne doesn't mention taking command, in fact his wording almost implies someone else was in charge.
brevet rank was just a title for seniority, I don't think there was any uniform distinctions, but i still get confused with brevet's, sometimes documents call officers by there brevet rank, other times the regimental rank, sometimes by there brevet even when it was given later on.
I am also guessing if he did take command, that he would have made sure he had a mount, who knows.
For the 3rd K.G.L I only have an incomplete list as follows
Lt-Colonel F. de Wissell
Major Anthony Boden severely
Captain Friedrich Didd killed
Lieutenant Friedrich von Jansen severely (killed)
Lieutenant F.Leschen severely (killed)
Lieutenant A.Kuckuck slightly
Lieutenant H.E.Kuckuck slightly
nothing to say de Wissell wasn't in command