An extended attack is a military tactic that involves a prolonged offensive against an enemy. It is usually characterized by a long period of bombardment and siege, which is why it is sometimes referred to as a siege. A siege is a prolonged military assault and blockade of a city or fortress with the intent of conquering by force or attrition. This type of attack has been used throughout history, most notably during the Middle Ages when castles were under siege for months or even years.