The Battle of Buir Lake (sometimes spelled Battle of Buyur Lake; simplified Chinese: 捕鱼儿海之战; traditional Chinese: 捕魚兒海之戰), also known as the Hongwu Emperor's Sixth Northern Expedition (Chinese: 明太祖第六次北伐; lit. 'Ming Taizu's sixth northern expedition'), was fought between the Ming dynasty and the Northern Yuan at Buir Lake in 1388. The Ming army was led by General Lan Yu, who undertook the military campaign against Uskhal Khan (Tianyuan Emperor), the Northern Yuan ruler. The Ming army defeated the Northern Yuan horde at Buir Lake, capturing many of their people.