Battle of Mansoura

On February 8, 1250, the crusader army of Louis IX confronted the Ayyubid and Mamluk forces at Mansourah, a fortified city in the Nile delta. The battle began with a remarkable tactical success: the king's brother, Robert of Artois, crossed a ford of the Nile with the vanguard and surprised the Ayyubid camp, killing the commander Fakhr ad-Din. But this initial victory turned into disaster when Robert, disobeying orders, plunged into the narrow streets of Mansourah without waiting for the main body of the army. Baybars' Mamluks counterattack fiercely, trapping the French knights in an urban maze where their heavy cavalry loses all advantage. The Crusader army suffered catastrophic losses, including the death of Robert of Artois and many knights. Louis IX, arriving as reinforcement, managed to stabilize the situation but could not prevent the gradual encirclement of his army, a prelude to the final defeat of Fariskur.

The seventh crusade, preached by Louis IX after the fall of Jerusalem to the Khwarezmians in 1244, adopted the same strategy as the fifth: striking Egypt to force the sultan to return the Holy Land. In June 1249, Louis IX landed in Damietta with an army of 15,000 men, including 2,000 knights. The city fell quickly, but the king waited six months for the Nile to flood to return to Cairo. Meanwhile, Sultan as-Salih Ayyub dies, leaving power to the Mamluks led by Shajar al-Durr and the future Sultan Aybak. In December 1249, the Crusader army left Damietta and moved up the Nile, establishing a camp opposite Mansourah, defended by the forces of Al-Muazzam Turanshah (son of as-Salih) and the Mamluks. The Crusaders built a dike to cross an arm of the Nile, but the work was slowed down by Egyptian attacks. On February 8, a Bedouin revealed the existence of a ford allowing them to bypass the defenses. Robert of Artois obtains authorization to carry out a diversionary attack, but transforms it into a general assault.

The battle illustrates both the audacity and recklessness of medieval chivalry. Robert of Artois' initial attack was brilliant: taking advantage of the ford revealed by the Bedouin, he crossed the Nile with 500 knights and 2,000 Genoese crossbowmen, surprised the Ayyubid camp at dawn, and killed Fakhr ad-Din in his bath. But Robert's disobedience transformed this success into a catastrophe: instead of returning to the main body of the army as planned, he pursued the fugitives into Mansourah. The French knights, heavy and encumbered, plunged into the narrow streets of the city where their mobility was zero. The Mamluks of Baybars, battle-hardened and mobile elite troops, counterattack from rooftops and alleys, using composite bows and short spears. The crusaders are caught in a pincer movement: those who advance are isolated, those who retreat are blocked by their own troops. Louis IX, arriving as reinforcement with the rest of the army, tried to stabilize the situation by forming a defensive square, but the losses were already irremediable. The battle demonstrates the superior mobility and tactical flexibility of the Mamluks against the rigidity of the heavy cavalry charge in an urban environment.

The Battle of Mansourah marks the fatal turning point of the Seventh Crusade. The losses were enormous: several thousand dead, including many high-ranking knights (Robert of Artois, Guillaume de Sonnac, master of the Temple, and numerous barons). The crusader army, weakened and demoralized, remained blocked in front of Mansourah, unable to advance towards Cairo. Epidemics (dysentery, scurvy) ravaged the camp, and supplies ran out. In March, Louis IX ordered the retreat towards Damietta, but the army was harassed by the Mamluks and surrounded at Fariskur on April 6, where the king was captured. The ransom of 800,000 gold bezants (approximately 400,000 tournament pounds) and the restitution of Damietta put an end to the crusade. For Egypt, the victory marked the rise of the Mamluks, who overthrew the Ayyubids in 1250 and established their own sultanate. For France, the failure was bitter, but Louis IX, released, prepared a new crusade (the eighth, in 1270). The defeat also reveals the limits of heavy chivalry when faced with mobile troops in an urban environment.