On the day of 643 years ago, on the 29th of May 1382 (April 16 of the Lunar Calendar 1382), Zhou Yuan established the Guard. On the 29th of May 1382 (April 16), Zhou Yuan established the Guard. It was the guardian of the royal palace's army, in charge of the emperor's ceremony. Zhou Yuan strengthened the monarchy, enabling the Guard to expand its powers, as well as to govern the prison, the North Guard and the North Guard, search for the thieves and rapists, and oversee the Guard. The chief officer as commander, often served by the Chongs and foreigners, has colleagues, entrepreneurs and other officers, and has official schools, specialized in reconnaissance.