It is Commanche. Not ridden by Custer, but by Myles Keogh who was killed at Little Big Horn. Commanche was considered the only military survivor, though other horses did in fact survive - Commanche was left on the battlefield by the Sioux because he was so badly wounded.
Here he is at the University of Kansas Natural History Museum:
Sorry Lee, he told me he wasn’t Mr Ed....
Correct Peter, that’s Trigger, the smartest horse in the movies, but what about the second part of the question?
That’s the one.....
I wanted a clip but couldn’t find it .... great easy watching film....it won’t be for everyone, but it just makes me chuckle....
Your go then Peter....
Sergeant Reckless , Korean War, obviously promoted sergeant, 51 solo trips (with no handler) to outpost Vegas in one day, after which she was retired. Died 1968.