Retreat of the Mongol Horde

…A new study looked not at military and historical records but at tree rings and found that the winter of 1241 was cold and snowy. Big deal. A little sold and snow couldn’t stop the mighty thundering army led by Genghis Khan’s grandson Batu, could it? No, but it could stop their horses. The Mongols depended on dry, flat plains for their fast and furious attacks and for grass to feed their all-important horses. The snowy winter of 1241 became the swampy spring of 1242, the plains became muck, the grass became scarce and the Mongol Horde became the army formerly known as the mightiest fighting machine of history as it picked up its saddles and went home.…