Incredible Scene LOL
IN THE OPENING CREDITS SCENE, RIVER CROSSING by the U.S. cavalry guarding the money coach -- the cavalry would be in a vulnerable position while making the crossing. Of course the simple thing for the officer to do is send out flankers right, left, and forward, to secure the men against ambush. But no! Everyone trots straight ahead, and are wiped out to the man.
Next, Cotton's gang, freshly away from Civil War combat in 1865, attack with hand grenades! HAND GRENADES IN 1865? I don't think so. Try World War I fifty years later.