 On 27 February, Turanshah, as new sultan, arrived in Egypt from Hasankeyf (Turkish for "rock fortress"), where he had been Emir (Arabic for "Prince") of Hisn Kayfa (Arabic for "rock fortress") since AH 636 (1238/1239 CE), and went straight to al-Mansurah to lead the Egyptian army.On 5 April 1250, covered by the darkness of night, the Crusaders evacuated their camp opposite al-Mansurah and began to flee northward towards Damietta.The Egyptians followed them into the Battle of Fariskur where the Egyptians utterly destroyed the Crusaders on 6 April.