William de Beaujeu arrived at the Temple of Acre on Saint Michael's Day, A. D. 1275, and immediately assumed the government of Palestine.[313] As there was now no hope of recovering the lost city of Jerusalem, he bent all his energies to the preservation of the few remaining possessions of the Christians in the Holy Land. At the expiration of the ten years' truce he entered into a further treaty with the infidels, called "the peace of Tortosa." It is expressed to be made between sultan Malek-Mansour and his son Malek-Saleh Ali, "honour of the world and of religion," of the one part, and Afryz Dybadjouk (William de Beaujeu) Grand Master of the order of the Templars, of the other part. The truce is further prolonged for ten years and ten months from the date of the execution of the treaty, (A. D. 1282;) and the contracting parties strictly bind themselves to make no irruptions into each other's territories during the period. To prevent mistakes, the towns, villages, and territory belonging to the Christians in Palestine are specified and defined, together with the contiguous possessions of the Moslems.[314] This treaty, however, was speedily broken, the war was renewed with various success, and another treaty was concluded, which was again violated by an unpardonable outrage. Some European adventurers, who had arrived at Acre, plundered and hung nineteen Egyptian merchants, and the sultan of Egypt immediately resumed hostilities, with the avowed determination of crushing for ever the christian power in the East. The fortress of Margat was besieged and taken; the city of Tripoli shared the same fate; and in the third year from the re-commencement of the war, the christian dominions in Palestine were reduced within the narrow confines of the strong city of Acre and the Pilgrim's Castle. In the spring of the year 1291, the sultan Khalil marched against Acre at the head of sixty thousand horse and a hundred and forty thousand foot.