Describing phalanx warfare, Thucydides wrote that “fear makes every man want to do his best to find protection for his unarmed side in the shield of the man next to him on the right.” The soldier farthest right must try to “keep his own unarmed side away from the enemy, and his fear spreads to the others who follow his example.” The effect of this fear, wrote the historian: “the right wing tends to get unduly extended.”