Cryptologic History Calendar
1951: Seoul, South Korea, recaptured by UN forces.
Excerpt from Wikipedia: Operation Ripper, also known as the Fourth Battle of Seoul, was a United Nations military operation conceived by the commander US Eighth Army, General Matthew Ridgway, during the Korean War. Operation Ripper was preceded by the largest artillery bombardment of the Korean War. On the middle, the U.S. 25th Infantry Division quickly crossed the Han and established a bridgehead. Further to the east, IX Corps reached its first phase line on 11 March. Three days later the advance proceeded to the next phase line. During the night of March 14–15, elements of the South Korean 1st Infantry Division and the US 3rd Infantry Division liberated Seoul, marking the fourth and last time the capital would have changed hands since June 1950. The Communist forces were compelled to abandon it when the UN approach to the east of the city threatened them with encirclement.