During the Second World War the Germans, who occupied the Channel Islands, modernised the castle with guns, bunkers and battlements.
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After the division of the Duchy of Normandy in 1204, the strategic location of the harbour led to the construction of the castle of Mont Orgueil to protect the island against the French, also serving as residence for Governors of Jersey until the late 16th century when Elizabeth Castle was constructed off Saint Helier.
Overton remained imprisoned in the Tower until in March 1658 when he was moved to Elizabeth Castle on the island of Jersey.