The increasing tension between Berke and Hulagu was a warning to the Golden Horde contingents in Hulagu's army that they had better escape. One contingent reached the Kipchak Steppe, another traversed Khorasan, and a third body took refuge in Mamluk ruled Syria where they were well received by Sultan Baybars (1260–1277). Hulagu harshly punished the rest of the Golden Horde army in Iran. 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, only to be routed in a surprise attack by Nogai's forces. Many of them were drowned as the ice broke on the frozen Terek River. The outbreak of conflict was made more annoying to Berke by the rebellion of Suzdal at the same time, killing Mongol darughachis and tax-collectors. Berke planned a severe punitive expedition. But after Alexander Nevsky begged Berke not to punish the Rus' and the Vladimir-Suzdal cities agreed to pay a large indemnity, Berke relented. Alexander died on his trip back in Gorodets on the Volga. He was well loved by the people and called the "sun of Russia".