““Conservative estimates place the Persian casualties at some two thousand in less than twenty minutes, victims of the unforgiving geometry of the battlefield. Because of the limitations of anatomy, humans are evolved to act effectively only in the direction that evolution has pointed eyes and hands. The consequences of this simple fact for military tactics, from Caesar to Napoleon to Patton, are always the same: Troops are more vulnerable on either side than they are in their front, and terribly so in their rear. Virtually the entire library of tactics, as set down in classics from Sun Tzu to Liddell Hart, consists of ornate descriptions of the best way to apply force—clubs, arrows, or .50 caliber machine-gun bullets—from your front to your enemies’ flank. And, obedient to the Golden Rule of Soldiering, to do so to him before he does so to you.””
