Yeah, he lost a battle against an overwhelming force. During the Civil War his was a brilliant tactician noted for his detailed planning and absolute fearlessness and was regarded as a bona fide hero. He understood his mission and loved to kill. He was also the father of the original wolverines.
You call him a brilliant tactician....after THAT statement??
Brilliant tacticians do NOT engage overwhelming forces, given the option, and he had MANY options.
Civil War exploits aside, his actions at Little Bighorn were deplorable.
I have walked the ground, and have many books about the battle, including "Crimsoned Prairie" and "A Terrible Glory", and "brilliant tactician" is not a valid descriptive, indeed quite the opposite.