So what is the magic ingredient that separates winners from losers? Is it better weaponry? The U.S. had that in Vietnam and still lost. Perhaps a stronger will to win? Could any have been stronger than that evidenced by the Japanese in WWII, and yet they were defeated. Maybe it’s the most effective use of terrain? Though Greece fell to Rome and the Germans despite inhabiting some of the most defensible terrain on the planet. Could it be the development and application of better doctrine? Imperial Germany had that in 1914 and yet couldn’t force its way past an enemy that simply dug into the ground.