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Some of the barons native to Jerusalem pointed out that it would be unwise to attack Damascus, as the Burid dynasty, though Muslim, were their allies against the Zengid dynasty. Imad ad-Din Zengi had besieged the city in 1140, and Mu'in ad-Din Unur, a Mamluk acting as vizier for the young Mujir ad-Din Abaq, negotiated an alliance with Jerusalem through the chronicler Usama ibn Munqidh. Conrad, Louis, and Baldwin insisted, Damascus was a holy city for Christianity. Like Jerusalem and Antioch, it would be a noteworthy prize in the eyes of European Christians. In July their armies assembled at Tiberias and marched to Damascus, around the Sea of Galilee by way of Banias. There were perhaps 50,000 troops in total.