The Song–Đại Việt war, also known as the Lý-Song War, was a military conflict between the Lý dynasty of Đại Việt and the Song dynasty of China between 1075 and 1077. The war was sparked by the shiftin

Cao Bằng is a province of the Northeast region of Vietnam. The province has borders with Tuyên Quang, Thái Nguyên and Lạng Sơn provinces within Vietnam. It has an international border with Guangxi pro