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In page Egypt in the Middle Ages:

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During the Crusades, al-Mustafa maintained himself in Alexandria, and helped the Crusaders[citation needed] by rescuing Jerusalem from the Ortokids, thereby facilitating its conquest by the Crusaders in 1099. He endeavoured to retrieve his error by himself advancing into Palestine, but he was defeated at the battle of Ascalon, and compelled to retire to Egypt. Many of the Palestinian possessions of the Fatimids then successively fell into the hands of the Crusaders.