Korean War Years Timeline

The Korean War was a three-year conflict that reshaped the Korean Peninsula and hardened the divisions of the Cold War. Often described as the "Forgotten War", it cost millions of lives and ended not with a peace treaty but with an armistice that still governs the border today. Understanding the conflict's chronology helps explain why the peninsula remains divided and why the Demilitarised Zone is one of the most heavily fortified frontiers in the world. The timeline below traces the key milestones, from the post-war division of Korea through to the signing of the armistice at Panmunjom.

How the Korean War Unfolded, Year by Year

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The war began on 25 June 1950, when forces of the Democratic People's Republic of Korea crossed the 38th parallel into the Republic of Korea. Seoul fell within days, and South Korean and allied troops were pushed back to the Pusan Perimeter by August. The tide turned on 15 September 1950 with the amphibious landing at Inchon, which recaptured Seoul and allowed United Nations forces to advance north towards the Yalu River. That advance triggered the intervention of the People's Republic of China in October 1950, and by January 1951 communist forces had retaken Seoul once more. United Nations forces recovered the city in March 1951, and the front line then stabilised roughly along the 38th parallel.

Armistice negotiations opened at Kaesong in July 1951 and dragged on for two years, stalled over the repatriation of prisoners of war and the location of a final demarcation line. Fighting continued throughout the talks, with costly battles for hills and outposts that produced little territorial change. General Douglas MacArthur was relieved of his command in April 1951 after publicly disagreeing with the Truman administration's limited-war strategy. In New Zealand, the government committed artillery and naval forces under the United Nations banner, and those personnel served with distinction through the final stages of the conflict.

The armistice was finally signed on 27 July 1953 at Panmunjom, establishing a military demarcation line and a demilitarised zone approximately four kilometres wide. No formal peace agreement has ever replaced it, so the two Koreas remain technically at war. Total casualties across both sides are estimated at several million, including civilians, making the conflict one of the deadliest of the twentieth century relative to its duration.

Key Dates at a Glance

August 1945: Korea is divided at the 38th parallel into Soviet and American occupation zones. August 1948: the Republic of Korea is proclaimed in the south. September 1948: the Democratic People's Republic of Korea is proclaimed in the north. June 1950: North Korean forces invade the south. September 1950: the Inchon landing reverses the war's momentum. October 1950: Chinese forces enter the conflict. January 1951: Seoul falls to communist forces for the second time. March 1951: Seoul is recaptured. July 1951: armistice talks begin. July 1953: the armistice is signed, ending active combat.