Professional soldiers are predictable, but the world is full of amateurs. Parade ground inspections are to combat readiness as mess hall food is to cuisine. Cold and snow are not neutral. The tank is a monument to the inaccuracy of indirect fire. Diplomacy has rarely been able to gain at the conference table what cannot be gained and held on a battlefield.
War is the unfolding of miscalculations.
Perfect is the enemy of good enough. He who wants do defend everything defends nothing. Mine fields are not neutral. They attack anyone. The effective radius of a hand grenade is always greater than the distance you can jump.