Read one of the NEW books about the battle before you go, which integrate the insights from the archaeological digs of the 1980's.
The best (but dry) academic summary, more like a crime scene report, is Richard Fox, "Archeology, History, and Custsr's Last Battle".
I read this one and the actual scientific report, with the field notes! Now that is DRY!!! There were a lot of myths "busted", there were a few substantiated "tales" But to this day nobody KNOWS why Custer did what he did!
I will allow you to form your own opinion! But do some research of your own, including a visit to the battle field(s). I had a friend born around 1910 who visited the Battlefield in the mid to late 20's. She has seen every movie, book, and magazine (think tabloid) written up to her death in 1999. We took a whole summer to research the finds after the burn off of the 80's. I loaned her some of the more "unusual" reading on the subject, I had the State library locate some books she recommended (but were out of print since before WWII.) With all the new and old information, it is amazing, how bad my High School teachers got it!
Here are some good questions for you to look at:
What was the cause of the whole situation from the Indian side? from the Government side?
How many Indian warriors were there? How many dependents?
How many Soldiers were there? What was the weaponry and ammo supply?
What amount did the troopers, NCO's and Officers have of things like age, when they enlisted, and training/experience?
What was the battle plan for each battalion? did they carry out their orders? why were so many Medals of Honor awarded?
How long was each phase of the battles(s)?
In the several court marshal proceedings, Who benefited from each testimony? each verdict? and each book published? Including the recent ones? (Dad always taught me to follow the money!)
A critically important one: How many horses were there on both sides?
An odd one: Who killed Custer? What happened to his body?
Not quite 150 years later, there is still a great deal of interest! We could start a whole forum thread just on Custer's side arm!
Ivan