Key Facts
- Duration
- 3 years, 1 month (June 1950 – July 1953)
- Estimated civilian deaths
- 1.5 to 3 million
- Military deaths
- ~1 million
- UN member nations in coalition
- 21
- US share of UN military personnel
- ~90%
- DMZ width established
- 4 km (2.5 miles)
Strategic Narrative Overview
North Korean forces captured Seoul within days and nearly overran the peninsula by August 1950, pinning UN troops to the Pusan Perimeter. A September amphibious landing at Inchon reversed the tide; UN forces recaptured Seoul and pushed into North Korea. China's intervention in October drove UN forces back south. Front lines stabilized near the 38th parallel by mid-1951, after which two years of attritional combat and armistice negotiations ground on amid heavy UN bombing of the North.
01 / The Origins
After Japan's 1945 defeat, Korea was divided at the 38th parallel into Soviet and American occupation zones. By 1948 each zone had formed a separate government: communist North Korea under Kim Il Sung and US-backed South Korea under Syngman Rhee. Both claimed sovereignty over the whole peninsula. Border clashes escalated until 25 June 1950, when the Soviet-equipped Korean People's Army launched a full-scale invasion of the south, triggering UN Security Council authorization of collective military force.
03 / The Outcome
The Korean Armistice Agreement was signed on 27 July 1953, ending active combat. It established a 4-kilometer Demilitarized Zone along the existing front and provided for prisoner exchange. No formal peace treaty followed. The peninsula remained divided roughly along the pre-war line, and North Korea became one of history's most heavily bombed nations. The conflict is officially a frozen war; sporadic confrontations have continued on the peninsula ever since.
Belligerents & Mobilization Analysis
Side A
3 belligerents
Kim Il Sung, Peng Dehuai.
Side B
3 belligerents
Douglas MacArthur, Matthew Ridgway, Syngman Rhee, Harry S. Truman.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.