First, I'll simply echo everyone who has already ripped into this poorly made film. I would like to point out two examples of the many things wrong historically about it.
For one small thing, a previous reviewer gave credit for the many references to 'Colonel' Custer in the film. However, that is actually an inaccuracy. After the Civil War, Custer, as did most high-ranking officers who remained in the army, reverted from his temporary rank of Major General of Volunteers to his permanent Regular US Army rank of Lieutenant Colonel. This rank actually made him second in command of the 7th Cavalry, but since the regiment's colonel remained in Washington DC, Custer retained operational field command of the 7th. He is, however, shown wearing the eagle shoulder epaulets of a full colonel, not the silver oak leaves of a lieutenant colonel. Nice try, but 'Fail' nonetheless.
For the most egregious big thing, Reno is supposed to be a bitter ex- Confederate Major General with a daughter who acts as the love interest for Captain Benton/(Benteen). In fact, Reno had been a Union brevet brigadier general with a decent combat record during the Civil War. Benteen was actually a Virginian by birth who remained loyal to the Union, earned an excellent combat record and was a temporary colonel who reverted to his permanent rank of captain at war's end. He also was married, but most certainly not to a daughter of Marcus Reno, who was actually the same age as Benteen!
That should be enough for anyone to dismiss this film as anything remotely resembling 'history'.