the mongols wanted to create a trade treaty and formalize their commercial relationship with the sultan. the merchants that genghis khan sent were murdered because of a greedy governor. genghis khan sent envoys to request that the sultan punish the official, but the sultan rebuked and killed the envoys, causing a war. the mongols took every major city in the khwarizm empire and the sultan was laid abandoned in the caspian sea (next to the middle east, (106-107), a combination of training, tactics, discipline, intelligence and constantly adapting new tactics gave the mongol army its savage edge against the slower, heavier armies of the times (AND THEIR COMPOSITE BOWS, which gave great power and range to penetrate plate armors in close distance).