Enclosed Defense is a military strategy that involves creating a fortified area to protect troops and resources from enemy attacks. This approach often includes barriers like walls, trenches, or natural obstacles, allowing defenders to control access and enhance their security. This tactic is commonly used in various historical contexts, such as during the Middle Ages with castles or in modern warfare with fortified bases. By concentrating forces within a secure perimeter, armies can better defend against assaults and maintain supply lines, ultimately increasing their chances of survival and success in combat situations.