Korean War Timeline By Mackmekler May 1, 1945 Korea Splits into North and South Jun 25, 1950 N. Korea invades South Jun 27, 1950 US joins war Jul 4, 1950 US defeated at Osan Sep 15, 1950 US recaptures Seoul Oct 20, 1950 US troops reach N. Korean Capital Feb 1, 1951 Peace talks begin Jul 27, 1953 N. and S. Korea agree to a truce