To catch thieves behind closed doors, literally, is a strategy to encircle the enemy, especially the small enemy. This scale is usually used in combination with other strategies. Quite a number of China military strategists have successfully locked the door to catch thieves, and the opening and closing are very timely and comfortable.
Burn one's bridges: the metaphor is not to stay backward, but to win the battle and make up your mind to go all out. Kettle: pot. Break the rice cooker and sink the ferry. The "burning the boat and breaking the kettle" mentioned in Sun Tzu's Art of War, although it also expresses the significance of desperate war, has not yet formed the allusions that are often said in later generations. It was not until "Historical Records" that the incident of "Xiang Yu's cross the rubicon" became typical: Xiang Yu took the lead to save the giant deer, and the first battle was less profitable. Xiang Yu led a great army to cross the Zhanghe River, cross the rubicon and boost morale. Finally, Su Jiao was killed, Wang Li was betrayed, and Qin Jun was defeated in Juluchang. Later, he expressed his determination in the way of "burning the boat" and did not hesitate.