[PitchBlende]

I'd have to say Vietnam, just because it showed that war has advanced over the years. They don't stand in lines and shoot eachother anymore. Plus it was a new way of fighting, instead of sending brigades into battle, mostly platoons and smaller units did the fighting.

As for battle, I'd have to say the battle of hill 881 in vietnam, when a USA Army 101st Airborne Platoon overran an entire NVA Regiment. For numbers that's about 45 americans vs. 3000 NVA.