its numbers, skills and will to win. You ever heard of a well financed with a lot of numbers kinda nation with trained soldier win? I don't think you hear that a lot. I mean take for instance china, their nationalists lost when they were financed by America because the will to win was so strong for the communists. Or we can use the current "war" in Afghanistan guess why the fighting is still going on? It is the WILL TO WIN. So basically you need numbers to frighten the enemy and lessen their will, skills to break formations and will to win so that your soldiers don't rout in the initial charge.
One day, someone showed me a glass of water that was half full. And he said, "Is it half full or half empty?" So I drank the water. No more problem. ~Alexander Jodorowsky