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According to the Wei Liaozi, a treatise on military matters dating from the late 4th or early 3rd century BC, the general Wu Qi was once offered a sword by his subordinates on the eve of battle. However Wu Qi refused to accept the weapon on the basis that banners and drums, the tools to lead and command, were the only instruments a general required. In his words, "to command the troops and direct their blades, this is the role of a commander. To wield a single sword is not his role." The point here is to highlight the idea that the general was the brain of the army, whereas the soldiers were to behave as the limbs. Heroic individual actions were disincentivized in preference to complete obedience and perfect coordination as a unit, a concept which the Wei Liaozi elucidates upon in another parable concerning Wu Qi: Prior to the beginning of a battle, one of Wu's soldiers broke from his ranks in his enthusiasm and charged the enemy line, slaying two men, and trotted back to his former position along with their heads as trophies. Wu immediately ordered the man to be put to death. When his officers protested that he was a fine warrior, Wu Qi answered, "He is indeed a fine warrior, but he disobeyed my orders." As with Sun Tzu and his Art of War, Wu Qi emphasized discipline and obedience before bravery as the most important traits in soldiery.