Crazy Horse deserves as big a memorial as he can get, in my opinion, but I think carving up mountains is a kind of strange idea. I'd be more inclined to build a statue.

Here are some other famous attacks that occurred at dawn in or the pre-dawn hours:

the final Mexican assault on the Alamo

the German assault on France and the Low Countries

the German assault on Russia

attack on Pearl Harbour (just before 8 AM, Hawaiian time)

D-Day seaborne landings (began at 6:30 AM)

Hell, make that EVERY significant German assault in WWII, and most of the significant Allied assaults as well. Dawn IS the natural time to attack if you want to attack with maximum effectiveness and make maximum use of the available hours of daylight.

Custer was vain. He was a braggart. He was an arrogant martinet. He lied to the Indians and assisted in the breaking of signed treaties. He was ruthless and merciless to their encampments. He was over-ambitious and reckless to a fault. He was a glory-seeker. But he sure as hell was no coward.

His one other good point, seemingly, was that he loved his very loyal wife Libby dearly, but...he was rumored to have had a significant affair with a Lakota Indian woman in any case.