When you consider that the small force at Beecher's Island was able to withstand multiple Indian attacks and hold on for a week or so, it's obvious that Custer should have been able to had he not divided his force. He may not have been successful against the villages, but he would have survived with far fewer casualties.
That’s quite a web-site, thanks for sharing. I saved it to refer to later. Indeed the US Army was undefeatable..and everywhere. Custer only needed a couple of days and the Army could have had the entire 6 battalions did I read? right there to help. Bear in mind the idea was to capture and place Indian forces back on the reservation...which was encroached by gold miners..”chiefed by the double tongues” as Ten Bears said.
Confusion regarding the settling of the West is partly fueled by innaccuracies in movies and stories as my Mom pointed out that Ten Bears was a Commanche not a Sioux...as he was in “Dances with Wolves”