IN MILITARY AFFAIRS THE STRENGTH OF AN ARMY is the product of its mass and some unknown x. . . . That unknown quantity is the spirit of the army, that is to say, the greater or lesser readiness to fight and face danger felt by all the men composing an army, quite independently of whether they are, or are not, fighting under the command of a genius, in two- or three-line formation, with cudgels or with rifles that repeat thirty times a minute. Men who want to fight will always put themselves in the most advantageous conditions for fighting.

—LEO TOLSTOY, WAR AND PEACE