UN casualties during the Inchon landings and subsequent battle for the city were 566 killed and 2,713 wounded. In the fighting the NKPA lost more than 35,000 killed and captured. As additional UN forces came ashore, they were organized into the US X Corps. Attacking inland, they advanced towards Seoul, which was taken on September 25, after brutal house-to-house fighting. The daring landing at Inchon, coupled with 8th Army's breakout from the Pusan Perimeter, threw the NKPA into a headlong retreat. UN troops quickly recovered South Korea and pressed into the north. This advance continued until late November when Chinese troops poured into North Korea causing UN forces to withdraw south.