Answer:
sending forces behind North Korean lines and landing at Inchon
Step-by-step explanation:
During the conflict of the Korean War, the United States stood on the side of South Korea.
The US forces made the offense into North Korea as part of the UN offensive. This happened at the end of 1950, but the offensive was later halted by Chinese intervention.
However, the war took a massive turn during the landing and battle of Inchon. The US party general, Douglas MacArthur, was leading the UN and South Korean Armies.
The battle ended in their favor with the victory for the UN. North Korea collapsed in the aftermath of the battle and offensive.