How a failed fire attack led to the fall of the last Fatimid fortress
In 1153, the Kingdom of Jerusalem besieged the coastal stronghold of Ascalon. After months of stalemate, a desperate attempt by the defenders to burn a Crusader siege tower backfired, causing their own walls to collapse. This accidental breach triggered a final, brutal assault that reshaped the map of the Levant.
Ascalon was a vital Fatimid Egyptian fortress that had long served as a staging ground for raids against the Kingdom of Jerusalem. By 1153, it stood as the final coastal city in Palestine outside Crusader control. King Baldwin III initiated a massive siege on 25 January 1153, surrounding the city by land and sea with a coalition of nobles, clergy, and military orders including the Knights Templar and Hospitallers.
The siege was marked by internal political instability on both sides. In Egypt, the vizier Ibn al-Sallar was assassinated in April 1153, leaving the city largely isolated. Simultaneously, the Crusaders had recently resolved a civil war between Baldwin III and his mother, Queen Melisende. Despite these distractions, the Crusaders maintained a blockade, bolstered by reinforcements from Easter pilgrims. The turning point occurred on 16 August, when a fire intended to destroy a Crusader siege tower instead caused a section of the city wall to collapse. Knights Templar led by Grand Master Bernard de Tremelay entered the breach but were killed by the larger garrison when the rest of the army failed to follow.
The city finally surrendered on 19 August 1153, with the formal takeover occurring on 22 August. While the victory was a major success for Baldwin III and opened a path for future invasions of Egypt, it proved to be a strategic double-edged sword. The focus on Egypt diverted Crusader attention from the rising power of Nur ad-Din, who unified Muslim forces in Syria by capturing Damascus in 1154. Historians like Malcolm Barber suggest that while the conquest of Ascalon was a significant territorial gain, the subsequent, failed attempts to conquer Egypt ultimately weakened the Crusader position, contributing to the eventual encirclement of the kingdom by Saladin in 1187.
Source: Siege of Ascalon
