In October 664, Goguryeo's ruler, Yeon Gaesomun died. In 665, a dispute broke out between his sons, which split the country into two. In May 666, Goguryeo's defeated leader, Nam-Saeng asked for help from Tang China. In June, the emperor decided to intervene in Goguryeo's civil war and sent an advance team to Goguryeo. In September, Tang`s General met with the son of Yeon Gaesomun, who was staying in Hyunto Castle.
In November 666, the commander-in-chief of Tang China Liji (李勣) left for the Xinchneg(新城), and in February 667, he crossed the Liao river and arrived there. Seven months of fighting took place, and in September the castle was occupied.
A supply route from China to Korean Penisula has been created. This was not enough. During the period from 667 to 668, the military had to spend the winter in Goguryeo. Because the front line was expanded and Goguryeo troops who surrendered had to eat, they needed a lot of food. There has been a supply demand that cannot be handled by land transportation.
After the capture of the Xincheng(新城), Liji rushed to the mouth of the Yalu River. It was a useful waterway open to the China. He captured the Daxing fortress where located on the Yalu River. It was able to transport, unload, and store supplies shipped from Shandong China. It was also an intermediate logistics base that could be re-distributed to Chinese troops in other areas where the waterway was located.
Having been able to receive continuous supply from China through the Daxing fortress port, the army was able to spend the winter in Goguryeo from 667 to 668. The war between Goguryeo and China changed its relationship with the past and as a result, Goguryeo was in danger of survival.
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