 Complete the following phrase:  After ravaging Georgia, the Mongols cut across the Caucasus Mountains during the winter to get around the Derbent Pass. The Mongols were tricked by their guides into taking a route and emerged from the mountains exhausted, only to be confronted with a far larger steppe coalition army. Using clever diplomacy, Subutai isolated and defeated the Alans, Circassians, and Don KipchaksCumans in detail. After plundering the southern Russian steppes, the Russian princes united with the retreating Cuman confederacy to defeat the Mongols with an 80,000 man host. Despite being heavily outnumbered, Subutai sacrificed the 1,000 men of his rear guard to induce the coalition army to recklessly pursue him and become separated. The plan worked out, but strategical advantage came at a high price. In all likelihood the 1,000 men were led by Jebe who was killed by some Kipchaks. As expected the coalition army pursued the Mongols and after retreating for 9 days, Subutai suddenly turned and crushed the combined Rus and Cuman army at the 