You can’t read about Custer at Little Big Horn without also reading about Custer at Gettysburg. You have to know both sides of the man. Too many people have only heard about his biggest mistake. He was brave beyond description and not a stupid man.
Brave? I suppose.
Tactical genius? Hardly..
He about got wiped out at Trevilian Station using the same tactics at LBH. In other words, he didn’t learn the lesson of splitting up his troops and hardly bothering to reconnoiter.
There were other blunders in other actions that he made too that cost his men dearly. Not many people care to read up on those incidents either. He’s famous because he died in battle during the Indian Wars and his wife saw to it that his legacy became legendary. Otherwise, he’d be about as well-known a general as Ranald MacKenzie or John S. Mosby.