Custer essentially used the same tactics at LBH as he used at the Washita 8 years earlier. An attack by a divided command on an Indian village that had not been scouted previously. At the Washita it worked (although he came close to possible defeat there as well...). At the LBH, it didn't. At the LBH, the Indian camps were far more concentrated with the population much more numerous, the terrain was considerably different and didn't lend itself to a defensive role, and Custer was ill served by his most senior officers.
But, that doesn't take away from his own culpability in the affair. As I stated, there's blame to go around just about anywhere one looks. That's true of the battle itself, as well as all the other forces at play.
True enough....and Custer came much closer to losing at the Washita than is generally supposed.
BTW: I'm given to understand the the BLB is still taught at West Point as how not to execute a battle plan. Hell, every one's got to be good for something!!!
Probably the same thing could be said of Joan d' Arc!