The North Vietnamese response to the incursion was gradual. Hanoi's attention was riveted on another diversionary maneuver being conducted by a U.S. naval task force off the coast of the North Vietnam. This force conducted all of the maneuvers necessary for the carrying out of an amphibious landing only 20 kilometers off the city of Vinh. Hanoi's preoccupation with a possible invasion did not last long. Its B-70 Corps commanded three divisions in the incursion area, the 304th, 308th and 320th. The 2nd Division had also moved up from the south to the Tchepone area and then began to move east to meet the ARVN threat. By early March, Hanoi had massed 36,000 troops in the area, outnumbering the South Vietnamese force by two-to-one.