Marshall participated in the post-Inchon landing discussion that led to authorizing Douglas MacArthur to conduct operations in North Korea. A secret "eyes only" signal from Marshall to MacArthur on September 29, 1950 declared the Truman administration's commitment: "We want you to feel unhampered strategically and tactically to proceed north of the 38th Parallel". At the same time, Marshall advised against public pronouncements which might lead to United Nations votes undermining or countermanding the initial mandate to restore the border between North and South Korea. Marshall and the Joint Chiefs of Staff were generally supportive of MacArthur because they were of the view that field commanders should be able to exercise their best judgment in accomplishing the intent of their superiors.