Ma Su (Youchang) (190-228) Strategist for the kingdom of Shu, and younger brother of Ma Liang. He was ordered to guard Jie Ting, along with Wang Ping. Ma Su stationed his troups on top of a mountain with no water. Zhange He soon surrounded the mountain and Ma Su, cutting off their water supplies. After great losses, Ma Su was ordered to be executed by Zhuge Liang.