Withdraw all troops, avoiding the enemy's direct attack. Observing changes in the situation at times should not involve withdrawing, this is also one of the principles of using soldiers.
At the end of the line, if there is no plan to implement, the withdrawal is the upper policy.
Worth withdrawing without withdrawing, not worth withdrawing but withdrawing, that is the lower book.
The last year of the Eastern Han Dynasty broke out in the Yellow Scarf revolt. The insurgents invaded Nguyen Thanh. The Han army under the leadership and commander of General Chu Hue came to the citadel. Although the Han army used the tactic of raising the east and west, it was still unable to retake the city.