 Shi Tianze, Zhang Rou, Yan Shi and other Han Chinese who served in the Jin dynasty and defected to the Mongols helped build the structure for the administration of the new Mongol state.The Mongols created a "Han Army" () out of defected Jin troops, and another army out of defected Song troops called the "Newly Submitted Army" ().Genghis Khan died in 1227 while his armies were attacking Western Xia.