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The most northern part reached was the Yalu River. This is when the Chinese people decided to intervene because the Northern Korean army had to cross into their territory as they were falling back. After this things started to settle down the end of the war was becoming closer and a reestablishment of the borders was imminent.
The most northern part in northernmost korean city that was reached was the Yalu River.
What is Yalu River.?
The Yalu River can be regarded as the Amnok River, which was the river on the border between North Korea and China.
This river caused the china to interfere with Korean war when United Nations troops were advancing northward toward the Yalu.
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