INTRODUCTION The Battle of Chosin Reservoir was a pivotal battle in the Korean War. The battle was a brutal 17-day battle in very cold weather, fought from November 27 to December 13, 1950. During the battle the US Chosin. on maps of the United States. Chinese forces quickly surrounded the U.S. troops and forced them to fight a retrograde attack to fight their way out to friendly lines to the south. HISTORY In the summer of 1950, after the successful landing at Inchon by the U.S. United Nations (UN) forces led by the US Eighth Army and X Corps were advancing north with the goal of fully reunifying North and South Korea. The Taebaek Mountains, an extremely rugged mountain range oriented from north to south, they divide Korea. The UN forces split into two groups during their advance: the Eighth Army advancing along the west coast and the US X Corps moving north along the east coast. On October 19, 1950, after repeated warnings to the United Nations, huge numbers of Chinese forces crossed the border into North Korea. After several minor skirmishes with the X Corps, the Chinese People's Volunteer Army (PVA) finally engaged the US X Corps in the vicinity of the Chosin Reservoir. Chosin Reservoir is a man-made lake located in the northeast of the Korean Peninsula. The battle was fought over some of the most rugged terrain during some of the harshest winter weather conditions of the Korean War. What few roads there were in the area were created by cutting through the mountainous terrain of... middle of paper... and rear covering forces to call for night airstrikes to quell the attacks.[86] ] The fighting lasted until the morning of December 2 until all the Marines managed to withdraw from Yudam-ni.[86] At the same time, the 1st Battalion, 7th Marines (1/7) also attempted to break the Chinese blockade on Hill 1419 on 1 December. 1/7th finally captured the peak and began marching through the hills on the east side of the road. On the morning of 2 December, a joint attack by Fox Company and the 1/7th secured the Toktong Pass, thus opening the road between Yudam-ni and Hagaru-ri.[90]Although the road was opened between Yudam- ni and Hagaru -ri, the convoy still had to fight among the numerous Chinese positions on the hills overlooking the road. The convoy reached Hagaru-ri in an orderly manner on the afternoon of 3 December, with the withdrawal completed on 4 December.[93]