 Complete the following phrase:  In 1277, Narathihapate, the king of the Burmese Pagan Kingdom, invaded the modern Dehong area. The Battle of Ngasaunggyan occurred on the bank of the Taping River, presently in Yingjiang County. The Yuan army only had 700 soldiers but eventually repelled the Burmese military of 40,000 to 50,000 soldiers with 10,000 horses and 800 elephants. It was the prelude to the 