 According to the Yuan dynasty chronicle and Marco Polo's accounts, a Burmese army "invaded" the Mongol territory of Gold Teeth, and was defeated by the Mongol army in April 1277.The battle took place either at the Vochang valley (in present-day Baoshan Prefecture) or 110 km southwest at Kanngai (present-day Yingjiang, Dehong Prefecture), which the Burmese called "Ngasaunggyan".The Yuan Chronicle reports that only 700 men defeated a Burmese army of 40,000 to 50,000 with 10,000 horses and 800 elephants.