Contrary to the advice of the Templars, he urged the crusaders, during the autumnal season, when the waters of the Nile were rising, to march out of Damietta to undertake an expedition against Grand Cairo. The disastrous results of that memorable campaign are narrated in the following letter from Peter de Montaigu to the Master of the English province of the order. “Brother Peter de Montaigu, humble Master of the soldiers of Christ, to our vicegerent and beloved brother in Christ, Alan Marcell, Preceptor of England. Hitherto we have had favourable information to communicate unto you touching our exertions in the cause of Christ; now, alas! such have been the reverses and disasters which our sins have brought upon us in the land of Egypt, that we have nothing but ill news to announce. After the capture of Damietta, our army remained for some time in a state of inaction, which brought upon us frequent complaints and reproaches from the eastern and the western Christians. At length, after the feast of the holy apostles, the legate of the holy pontiff, and all our soldiers of the cross, put themselves in march by land and by the Nile, and arrived in good order at the spot where the sultan was encamped, at the head of an immense number of the enemies of the cross. The river Taphneos, an arm of the great Nile, flowed between the camp of the sultan and our forces, and being unable to ford this river, we pitched our tents on its banks, and prepared bridges to enable us to force the passage. In the mean time, the annual inundation rapidly increased, and the sultan, passing his galleys and armed boats through an ancient canal, floated them into the Nile below our positions, and intercepted our communications with Damietta.”... “Nothing now was to be done but to retrace our steps. The sultans of Aleppo, Damascus, Hems, and Coilanbar, the two brothers of the sultan, and many chieftains and kings of the pagans, with an immense multitude of infidels who had come to their assistance, attempted to cut off our retreat. At night we commenced our march, but the infidels cut through the embankments of the Nile, the water rushed along several unknown passages and ancient canals, and encompassed us on all sides. We lost all our provisions, many of our men were swept into the stream, and the further progress of our christian warriors was forthwith arrested. The waters continued to increase upon us, and in this terrible inundation we lost all our horses and saddles, our carriages, baggage, furniture, and moveables, and everything that we had. We ourselves could neither advance nor retreat, and knew not whither to turn. We could not attack the Egyptians on account of the great lake which extended itself between them and us; we were without food, and being caught and pent up like fish in a net, there was nothing left for us but to treat with the sultan.