Berke sought a joint attack with Baybars and forged an alliance with the Mamluks against Hulagu. The Golden Horde dispatched the young prince Nogai to invade the Ilkhanate but Hulagu forced him back in 1262. The Ilkhanid army then crossed the Terek River, capturing an empty Jochid encampment. On the banks of the;Terek, he was ambushed by an army of the Golden Horde under Nogai, and his army was defeated at the Battle of the Terek River (1262), with many thousands being cut down or drowning when the ice of the river gave way. Hulegu subsequently retreated back into Azerbaijan.