The document discusses the Mongol army's success under Genghis Khan. It describes how the Mongols celebrated a victory over the Sartool people led by Genghis Khan. It also mentions that during the celebrations, Esunke Qongodorun shot an arrow 335 fathoms into the air. The document then provides instructions on taking organized notes from historians' explanations for the Mongol army's success, which will help write an essay on the topic. Notes should be taken without cramming and with space left to add more notes later.