우문술
The army contingent, led by generals Yu Zhongwen and Yuwen Shu, had their own problems. While the supply could be transported safely within China, once it reached Goguryeo territory, there was a danger of ambush by Goguryeo forces. Emperor Yang solved the problem by instructing each soldier to carry food for himself, which greatly increased each soldier's burden. Many resorted to discarding the food. By the time it had reached the Yalu River, the army's shortage of provisions was acute.