Saladin revived the Egyptian naval force and tried to capture Beirut, but his ships were forced to retreat. Raynald ordered the building of five ships which were carried to the Gulf of Aqaba at the northern end of the Red Sea in February 1183. Raynald laid siege to the Egyptian fortress on Ile de Graye. Part of his fleet made a plundering raid along the coasts, threatening the security of the holy cities of Mecca and Medina. Raynald left Ile de Graye, but his fleet continued the siege. Saladin's brother, Al-Adil, the governor of Egypt, dispatched a fleet to the Red Sea. The Egyptians relieved Ile de Graye and destroyed the Christian fleet. Raynald's soldiers were executed, and Saladin took an oath that he would never forgive him. Though Raynald's naval expedition "showed a remarkable degree of initiative", according to historian Bernard Hamilton, most modern historians agree that it contributed to the unification of Syria and Egypt under Saladin's rule. Saladin captured Aleppo in June 1183, completing the encirclement of the crusader states.