The Siege reference article from the English Wikipedia on 24-Apr-2004
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Siege

Sponsorship the way you would do it

A siege is a prolonged military assault and blockade on a city or fortress with the intent of conquering by force or attrition. Sieges usually involve surrounding the target and blocking the provision of supplies.

Defenses:

Siege weapons: Other: See also: Siege engine

Famous Sieges