 The remnants of the Byzantine troops boarded their ships, but the Byzantine fleet was destroyed at the Battle of the Straits by Hasan's cousin Ahmad, sealing the fate of Rometta.The city surrendered a few months later, in early 965, after its provisions were exhausted and its inhabitants started fleeing the city.In 971, the Qarmatians launched an invasion of Egypt, which had been conquered just two years before by the Fatimid general Jawhar.