western/frontier movie heart pounding scene

rough description – native americans raid american raildroad and for some reason they are forced to sign a treaty, the treaty get broken by a US colonel, the native americans raise up a US flag as a sign so the colonel would tell his men to stop shooting but the colonel ignored it and at the end of the battle, there was one native left and the whole cavalry regiment beat him to death (very familiar to the scene in THE LAST SAMURAI)

not all about this description may be 100 percent right but if anyone can figure out this movie, YOU ARE MY HERO because i just randomly start remember this scene from childhood and now i cant stop thinking about it

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