Background
By mid-1950 after the successful landing at Inchon by the US X Corps and the subsequent destruction of the Korean People's Army, the Korean War appeared to be all but over. United Nations (UN) forces advanced rapidly into North Korea with the intention of reuniting North and South Korea before the end of 1950. North Korea is divided through the center by the impassable Taebaek Mountains, which separated the UN forces into two groups. The US Eighth Army advanced north through the western coast of the Korean Peninsula, while the Republic of Korea (ROK) I Corps and the US X Corps advanced north on the eastern coast.
At the same time the People's Republic of China entered the conflict after issuing several warnings to the United Nations. On 19 October 1950, large formations of Chinese troops, dubbed the People's Volunteer Army (PVA), secretly crossed the border and into North Korea. One of the first Chinese units to reach the Chosin Reservoir area was the PVA 42nd Corps, and it was tasked with stopping the eastern UN advances. On 25 October, the advancing ROK I Corps made contact with the Chinese and halted at Funchilin Pass, south of the Chosin Reservoir. After the landing at Wonsan, the US 1st Marine Division of the X Corps engaged the defending PVA 124th Division on 2 November, and the ensuing battle caused heavy casualties among the Chinese. On 6 November, the PVA 42nd Corps ordered a retreat to the north with the intention of luring the UN forces into the Chosin Reservoir. By 24 November, the 1st Marine Division occupied both Sinhung-ni on the eastern side of the reservoir, and Yudami-ni on the west side of the reservoir.
Faced with the sudden attacks by Chinese forces in the Eighth Army sector, General Douglas MacArthur ordered the Eighth Army to launch the Home-by-Christmas Offensive. To support the offensive, MacArthur ordered the X Corps to attack west from the Chosin Reservoir and to cut the vital Manpojin—Kanggye—Huichon supply line. As a response, Major General Edward M. Almond, commander of the US X Corps, formulated a plan on 21 November. It called for the US 1st Marine Division to advance west through Yudami-ni, while the US 7th Infantry Division would provide a regimental combat team to protect the right flank at Sinhung-ni. The US 3rd Infantry Division would also protect the left flank while providing security in the rear area. By then the X Corps was stretched thin along a 400 miles (640 km) front.
Surprised by the Marine landing at Wonsan, China's Chairman Mao Zedong called for the immediate destruction of the ROK Capital Division, ROK 3rd Infantry Division, US 1st Marine Division, and US 7th Infantry Division in a telegraph to Commander Song Shi-Lun of the PVA 9th Army on 31 October. Under Mao's urgent orders, the 9th Army was rushed into North Korea on 10 November. Undetected by UN intelligence, the 9th Army quietly entered the Chosin Reservoir area on 17 November, with the 20th Corps of the 9th Army relieving the 42nd Corps near Yudami-ni.
Read more about this topic: Battle Of Chosin Reservoir
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