Quote by Hasso von Manstein
"In warfare, the unexpected often matters more than the expected; therefore, a commander must constantly ask himself what assumption he has made that might prove false."
More from Hasso von Manstein
"The task of the general is to win wars, not battles."
"In war, the moral is half; only the other half is numbers."
"Victory is not final, defeat is not fatal."
"The art of war is simple enough. Find out where your enemy is. Get at him as soon as you can. Strike him as hard as you can, and keep moving on."