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Roger Mortimer was imprisoned in the Tower of London after his surrender at Shrewsbury and some of his supporters, including William Trussell, continued to raid Despenser lands. In August 1323 Mortimer escaped and attempted to break other Contrariants out of Windsor and Wallingford Castles. He eventually fled to France where he was later joined by Queen Isabella, who was ostensibly on a peace mission, but was actually seeking assistance from her brother, King Charles IV of France to oust the Despensers. Mortimer and Isabella obtained the necessary help in Flanders and in 1326 the successful Invasion of England was launched.