According to my greatuncle, whose father helped cook Custer’s goose, there were relatively few Indians involved. There were only about 250 Indians that broke Custer’s attack and very probably broke the cohesiveness of his command. After that it was merely a case of the Sioux/Cheyenne running down the survivors.
263 US Cavalry died that day.
Historians said that 1’000 Indians fought Custer’s 210 men on Custer battlefield, while ZERO Indian was threatening Benteen’s and Reno’s 400 men fifteen minutes away (at a gallop)