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.
... March 23 - Joan Crawford, actress
March 26 - Joseph Campbell, author and expert on mythology
March 28 - Werner Bahlsen[?], biscuit[?] producer (+ 1985)
April 3 - ...