The phenomenon is timeless: the soldier who feels he is losing the support of those around him is borne back into an intolerable primitive terror. He fears he will face death alone. Many great military leaders have turned this terror into strategy. Genghis Khan was a master at it: using the mobility of his Mongol cavalry to cut off his enemies’ communications, he would isolate parts of their armies to make them feel alone and unprotected. He worked consciously to instill terror. The divide-and-isolate strategy was also used to great effect by Napoleon and the guerrilla forces of Mao Tse-tung,
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