Man has never made any material as resilient as the human spirit. The direct use of force is such a poor solution to any problem, it is generally employed only by small children and large nations. If the enemy is to be coerced, you must put him in a situation that is even more unpleasant than the sacrifice you call on him to make. The hardships of the situation must not be merely transient - at least not in appearance. Otherwise, the enemy would not give in, but would wait for things to improve.
Most human beings have an almost infinite capacity for taking things for granted.
The idea of all-out nuclear war is unsettling. The conditions of conquest are always easy. We have but to toil awhile, endure awhile, believe always, and never turn back. The most important qualification of a soldier is fortitude under fatigue and privation. His left arm, which was amputated after the battle of Chancellorsville was buried on a nearby farm.