أرناط
An earthquake destroyed Tripoli, Arqa and Krak des Chevaliers in August 1157. Taking advantage of the arrival of Thierry, Count of Flanders () at the head of a sizeable army in October, Baldwin III, Raynald of Châtillon and Raymond decided to launch a joint campaign against the Muslim towns of North Syria which had also been ruined by the catastrophe. The crusaders first attacked Chastel Rouge near the border of the County of Tripoli, but they could not force the defenders to surrender. They could not seize Shaizar, either; Thierry of Flanders and Raynald of Châtillon claimed the town even before it was occupied, and they could not reach a compromise. The siege of Harenc (now Harem in Syria) was a success, but the crusading leaders finished the campaign after they captured it in January 1158.