MacArthur's plan to land behind North Korean lines was so crazy his own generals begged him not to. The tides gave them 3 hours to get 75,000 men ashore. It worked perfectly.
In August 1950, with UN forces pinned in the Pusan Perimeter, General Douglas MacArthur proposed a solution so audacious it left the Joint Chiefs of Staff speechless: an amphibious landing at Inchon, a port city on South Korea's western coast, deep behind North Korean lines. The operation would require 75,000 troops and 261 ships — the largest amphibious assault since D-Day.
Inchon was considered nearly impossible. Its tides were among the most extreme in the world — up to 36 feet of fluctuation — leaving vast mudflats exposed twice a day. The channel into the harbor was narrow, winding, and could easily be mined. There was no beach — troops would have to scale 12-foot seawalls using ladders while taking fire. The window of adequate water depth was just three hours. Senior naval officers told MacArthur the operation had a 5,000-to-one chance of failure.
MacArthur's response became legendary. He told the assembled generals and admirals: 'The very factors that you have listed as making Inchon impractical are the same reasons why the North Koreans will not be expecting us. For the same reasons, I will attack at Inchon.' He got his approval. Operation Chromite launched on September 15, 1950.
The landing achieved complete surprise. North Korean forces at Inchon were minimal and unprepared. Marines scaled the seawalls, secured the port, and began pushing inland. Within five days they had captured Kimpo Airfield — the largest in South Korea — and were closing on Seoul. The capital fell on September 27, less than two weeks after the landing.
The strategic effect was catastrophic for North Korea. Their forces in the south were suddenly cut off from their supply lines and threatened with encirclement. What had been an orderly advance became a panicked retreat. UN forces broke out of the Pusan Perimeter simultaneously, and the North Korean army — which weeks earlier had nearly conquered the entire peninsula — disintegrated. Over 135,000 North Korean soldiers were captured.
MacArthur was lionized. He had pulled off one of the most spectacular military reversals in history. Time magazine called him a genius. Congress considered giving him a fifth star. He had gone from near-defeat to near-total victory in six weeks. It was the peak of his career — and the moment that planted the seeds of his undoing, because it convinced him he could do no wrong.
The Inchon landing is still studied at military academies as one of the boldest and most successful amphibious operations in history. It also demonstrated both the genius and the danger of MacArthur's style: a commander who backed his own judgment absolutely, who inspired extraordinary results when right, but who would prove catastrophically unwilling to hear that he was wrong when the next phase of the war turned against him.