What is the term used for offensive activity against a withdrawing enemy?

The term for offensive activity against a withdrawing enemy is pursuit. In a military context, pursuit refers to the operation conducted by forces to follow and attack an enemy that is retreating or withdrawing from engagement. This tactic aims to exploit the enemy's disorganization and maintain pressure, potentially leading to their defeat.

In contrast, ambush involves surprise attacks on an enemy from concealed positions, typically when they are advancing or stationary, rather than in withdrawal. Assault refers to a direct and violent attack, but it doesn't specifically denote targeting a retreating enemy. Retreat, on the other hand, is the action of withdrawing from an engagement, which is the opposite of engaging an enemy in pursuit. Thus, pursuit effectively captures the essence of attacking an enemy who is fleeing from combat.