In 1248 he collected a large army, and prepared to start by way of Sicily, the nearest route to Palestine, when he remembered that the island belonged to Frederick II., of Germany, who was under excommunication by the Pope. All attempts to shake the decision of Innocent IV. failed; and yielding to the pious weakness of fearing to rest in an excommunicant's territory, Louis changed his plans, and determined to pass by way of Cyprus and Egypt--a route which proved the ruin of the expedition. He committed the regency of France to his mother, assumed the staff of pilgrimage, and accompanied by his wife and brothers, left Paris on June 12, 1248. He stayed for several months in Cyprus, until his armament amounted to 50,000 men, and then sailed for Egypt. Arrived at the port of Damietta, he caused the oriflamme (the national standard of France) to be waved above his head; and, arrayed in complete armor, he unsheathed his sword, and leaped into the sea, followed by the knights. The inhabitants fled, and the French took possession of the city. The inundation of the Nile prevented their further movements for several months. Licentiousness and disease were fostered by this delay, in spite of the king's remonstrances; and their unopposed success made the Crusaders careless as to the tactics of the enemy. On the subsidence of the Nile, Louis fortified Damietta, and left his queen and her ladies there, while he, with the main army, advanced on Cairo, the metropolis of Egypt, where the sultan resided. Near Mansourah, the Crusaders became perplexed by the intricacy of the canals, and a hasty dash across one of these, made by the king's brother, the Count of Artois, with 2,000 men, led to a calamitous result. Mansourah was apparently deserted, and the count's troops, who preceded their comrades at some distance, commenced pillaging the houses. The inhabitants, who were only concealed, showered down stones from the roofs; and at the same moment, a large body of the sultan's army made an attack in front. Louis reached Mansourah in time to save a few of his men, but found his brother and several others slain. The Moslem camp was captured, but proved a doubtful prize. The plains were barren and scorching, and the harassing assaults of the Egyptians, who poured "Greek fire" (missiles filled with combustible materials) on their foes, rendered the situation more intolerable still. Pestilence broke out, and the king himself fell dangerously ill. He then ordered a retreat to Damietta, whither the sick were to be conveyed in galleys. These were intercepted, and the sick murdered by the Egyptians; while, at the same time an attack was made on the Christian camp. [Illustration: St. Louis.]