In the history of the Viet Hoa war, Lang Son has always been considered a key strategic position and the main attack direction of the Chinese army. The reason is because the terrain there is a plain. The capture of Lang Son was to occupy the gate of the Red River delta, and only one hundred and fifty kilometers along Highway 1 was to reach Hanoi. Cowgirl and dog and she lived happily ever after poster. From the Song, Nguyen, and Minh dynasties, to the Qing Dynasty, when invaded.