In early 1137, Zengi invested the castle of Ba'rin, about 10 miles northwest of Homs. When King Fulk marched with his host to raise the siege, his army was attacked and scattered by Zengi's forces. After their defeat, Fulk and some of the survivors took refuge in Montferrand castle, which Zengi surrounded again. "When they ran out of food they ate their horses, and then they were forced to ask for terms." Meanwhile, large numbers of Christian pilgrims had rallied to the army of Byzantine Emperor John II Comnenus, Raymond of Antioch and Joscelin II of Edessa. With this host approaching the castle, Zengi suddenly granted Fulk and the other besieged Franks terms. In return for their freedom and evacuation of the castle, a ransom was set at 50000 dinar. The Franks, unaware of the imminent arrival of the large relieving army, accepted Zengi's offer. Ba'rin was never recovered by the Franks.