Bravery/Cowardice at the battle isn’t a blanket statement.
You want bravery? Read up on James Butler, Capt. Weir and his rescue attempt, or Keogh’s men surrounding their decorated Captain after he fell off his horse from a shot through the leg. His line collapsing basically caused the rest of Custer’s unit to stampede or panic.
If you want cowardice, well read up about Curly, one of Custer’s scouts. Or all of the men who died in the deep ravine (at least 20 of them).
There’s plenty of both to go around.
I stand with what I said about the Indians praising the troopers for their bravery.