When the Chinese invaded the country in 1076, the general Lý Thường Kiệt wrote a 4-line poem Mountains and rivers of the Southern country.
#The poem Nam quốc sơn hà (Mountains and rivers of Southern country) was written in 1077 by Lý Thường Kiệt and recited next to the defense line of the Như Nguyệt river (Cầu river), originally with the reason to incentive the spirit of the soldiers.
These writings are indistinguishable from contemporaneous classical Chinese works produced in China, Korea, or Japan as are the first poems in chữ nho by the monk Khuông Việt and the Nam Quốc Sơn Hà by general Lý Thường Kiệt.
After the victory against the Song, he also led a Vietnamese army to invade Champa two times with big victories.
After a rapid advance in the territory of Đại Việt, the Song forces were stopped by the Lý defence line along the Như Nguyệt River led by Lý Thường Kiệt.