High Quality Content by WIKIPEDIA articles! The siege of Colchester occurred in the summer of 1648 when the English Civil War reignited in several areas of Britain. Colchester found itself in the thick of the unrest when a Royalist army on its way through East Anglia to raise support for the King, was attacked by Lord-General Thomas Fairfax at the head of a Parliamentary force. The initial Parliamentary attack forced the Royalist army to retreat behind the town`s walls but was unable to bring about victory, so settled down to a siege. Despite the horrors of the siege, the Royalists resisted for eleven weeks and only surrendered following the defeat of the Royalist army in the North of England at the Battle of Preston (1648).