structural:summarization
Battle of Incheon (September 1950)

Against the rested and rearmed Pusan Perimeter defenders and their reinforcements, the KPA were undermanned and poorly supplied; unlike the UN, they lacked naval and air support. To relieve the Pusan Perimeter, MacArthur recommended an amphibious landing at Incheon, near Seoul, well over 160 km (100 mi) behind the KPA lines. On 6 July, he ordered Major General Hobart R. Gay, commander of the U.S. 1st Cavalry Division, to plan an amphibious landing at Incheon; on 12–14 July, the 1st Cavalry Division embarked from Yokohama, Japan, to reinforce the 24th Infantry Division inside the Pusan Perimeter.

Soon after the war began, MacArthur began planning an Incheon landing, but the Pentagon opposed him. When authorized, he activated a combined US Army and Marine Corps, and ROK force. The X Corps, consisted of 40,000 troops of the 1st Marine Division, the 7th Infantry Division and around 8,600 ROK soldiers. By 15 September, the amphibious force faced few KPA defenders at Incheon: military intelligence, psychological warfare, guerrilla reconnaissance, and protracted bombardment facilitated a light battle. However, the bombardment destroyed most of Incheon.