Mongol invasion of Circassia

The Mongol invasion of Circassia and Alania was the invasion of Zichia (Circassia) and Alania by the Mongol Empire in 1237. William of Rubruck, who travelled to the Caucasus in 1253, wrote that the Circassians had never "bowed to Mongol rule", despite the fact that a whole fifth of the Mongol armies were at that time devoted to the task of crushing the Alano-Circassian resistance.