News of Edessa's fall stunned Europe and caused Christian authorities in the West to call for another Crusade. Led by two great rulers, King Louis VII of France and King Conrad III of Germany, the Second Crusade began in 1147.
After Louis and Conrad managed to assemble their armies at Jerusalem, they decided to attack the Syrian stronghold of Damascus with an army of some 50,000.
Damascus's ruler was forced to call on Nur al-Din, Zangi's successor in Mosul, for aid. The combined Muslim forces dealt humiliating defeat to the Crusaders, decisively ending the Second Crusade.