Obvious stunt doubles used in the fight between Shafter and Donavan and in the two fights between Shafter and Garnett.
Unlike as shown in this film, the 7th Cavalry did not have repeating rifles during the fight at the Little Big Horn.
The big tree is seen being felled but the shots of the wood being loaded in he wagons is obviously not from the tree as it's no where near thick enough.
A troop of soldiers are on a wood gathering detail but 2 in white hats sawing a tall thick tree are obviously not soldiers.