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Master Mao says: Discipline refers to the act of first informing one's subordinates of the methods for assigning soldiers and the specific articles of prohibition. As for the ability to produce infinite and extraordinary strategies, that relies entirely on how one implements and responds to the unfolding situation.
The Complete Essentials for the Military Classics original: 武經總要 (Wujing Zongyao), a foundational military compendium from the Song Dynasty (1044 AD) that Mao Yuanyi frequently cites as an authoritative source. states: Regarding the methods for defending a city: Whenever the enemy or rebels are about to arrive within five hundred paces a bu (pace) was a standard military measurement, approximately 1.5 meters or 5 feet of the city walls, the defenders must cut down all timber, destroy bridges, burn or discard any standing dry grass, demolish houses outside the walls, and fill in wells. Any water springs or wells should...