 Complete the following phrase:  Charlemont Fort retained its military significance after Tyrones Rebellion came to an end. Caulfeild rebuilt the defences in 1622, adding a three-storied governors house. At the outbreak of the 1641 Rebellion, the fort was taken by Sir Phelim ONeill in a surprise attack. A number of attempts were made to recapture it, but despite the efforts of both Royalists and Coveters it remained in ONeills hands until 1650, when a 