If I remember correctly from a History channel show on the subject; didn't Custer's forces have an issue with buying cartridges with brass that was too thin? I think it caused tearing of the casings on ejection; requiring them to ram the rest of the casing out with a rod. In defense of superior firepower being important at times, didn't Custer also leave his Gatling guns behind? Those would have been rather helpful when they started getting pushed back. That whole battle was lost by cockiness, in my opinion. To me, there seems to be one thing much more important than weapons: tactics. From what I recall, Literature on former tactics are still recommended reading for US military officers and Marine Corps forces in general (via the Commandant's reading list). For us, "Engage, close with, and destroy the enemy." was the mantra that was beaten into our heads. Tactics trump technology, especially when you make the mistake of thinking you've won before battle begins.