Where they Americans then?

The Native Americans defeated a US military force. They had been given guns by the British (as part of a strategy of encouraging insurrection against the American government).

*632 killed but that's still a lot

Yes, the British formally recognized US sovereignty in 1783.

or Custer using single shot rifles on foot, while being circled by horseback riders with lever action rifles?

all because he was in such a rush he left his Gatling guns behind?

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1812 don't count. :(

My lands are where my dead lie buried - Crazy Horse

One of the greatest American military minds ever.