Korean War: After four days, the No Gun Ri Massacre ends when the US Army 7th Cavalry Regiment is withdrawn.

The Korean War was an armed conflict on the Korean Peninsula fought between North Korea and South Korea and their allies. North Korea was supported by China and the Soviet Union, while South Korea was supported by the United Nations Command (UNC) led by the United States. The conflict was one of the first major proxy wars of the Cold War. Fighting ended in 1953 with an armistice but no peace treaty, leading to the ongoing Korean conflict.

The No Gun Ri massacre was a mass killing of South Korean refugees by U.S. military air and ground fire near the village of Nogeun-ri (노근리) in central South Korea between July 26 and 29, 1950, early in the Korean War. In 2005, a South Korean government inquest certified the names of 163 dead or missing and 55 wounded, and added that many other victims' names were not reported. The No Gun Ri Peace Foundation estimates 250–300 were killed, mostly women and children.

The 7th Cavalry Regiment is a United States Army cavalry regiment formed in 1866. Its official nickname is "Garryowen", after the Irish air "Garryowen" that was adopted as its march tune. The regiment participated in some of the largest battles of the American Indian Wars, including its famous defeat at the Battle of the Little Bighorn, where its commander Lieutenant Colonel George Armstrong Custer was killed. The regiment also committed the Wounded Knee Massacre, where more than 250 men, women and children of the Lakota were killed.