The Battle of Pusan Perimeter was a significant conflict during the Korean War, occurring from August to September 1950. It involved United Nations forces, primarily from the United States, defending a perimeter around the city of Pusan against the advancing North Korean army. The battle was crucial in preventing the North Koreans from capturing the southern part of the Korean Peninsula. The UN forces, despite being outnumbered, utilized strategic positions and effective supply lines to hold their ground. The successful defense at the Pusan Perimeter allowed for a counteroffensive, leading to the Incheon Landing and ultimately shifting the momentum of the war in favor of the UN forces.