Question

Why did general douglas macarthur risk landing marines in enemy held territory at inchon?

Answer 1

MacArthur wanted to cut the supply lines of the North Korean army.

Answer 2

The reason why general douglas macarthur risk landing marines in enemy held territory at incheon was : That territory served as an important point in enemy's supply line.
By landing our troops here, we managed to cut out the supply of enemy's army, which brought a huge outcome that end the war.