Meng You

Meng You is the younger brother of Meng Huo. During the Southern Campaign of Shu, Meng You fought against Zhuge Liang. After Meng Huo kept continuously losing many battles against Shu, he called on the help of King Duosi, who then used the water spring tactic against Zhuge Liang. Meng You ended up later pledging his allegiance to Zhuge Liang, along with his brother.