With that many Indians I’m not so sure a Gatling gun would’ve made much a difference.
I had read somewhere that they had difficulty traveling with the Gatling guns. The parts would constantly come loose from the packs and cause the teamsters to stop and repack/lash them up again.
As for the Springfields, the one downside was the copper cases would cause jams which negated the speed at which they could be fired. I believe they were using the 45/50 which was a down loaded 45/70 for use with the carbines
