Withdrawal (military)
In warfare, the long-term strategy is the defeat of the enemy. An effective tactical method is to demoralize the enemy. This is usually done by defeating their army. This is also done by routing them from the battlefield. Once a force had become disorganized it loses its ability to fight as a unit. The victors can chase down the fleeing soldiers. The victors can also attempt to cause as many casualties as possible. They also may try to take as many prisoners as possible.