Answer:
Siege
Explanation:
A SIEGE is a form of military strategy in war, whereby an enemy is encircled and all supplies including food, war mercenaries, weapons, etc, are cut off. The purpose is to force an enemy to surrender. This war strategy is very common in ancient times, where building wall surrounding the cities is a form of war defense.
Hence, SIEGE is a war strategy to beat an opponent by cutting off its supply chain.
