The 4th Marine Division landed on 24 July 1944, supported by naval bombardment and marine artillery firing across the strait from Saipan. With the help of Seabee ingenuity the Marines were able to land along the Northwest coast with its two small beaches and low coral. The rest of the island had coral cliffs up to 15 feet in height at the water's edge negating any assault plans. Commodore Paul J. Halloran (CEC) CB theater commander provided drawings of a conceptual landing ramp for the 18th and 121st CBs to fabricate. To construct these ramps, the plans called for the CBs to mount steel beams salvaged from Saipan's abandoned sugar mill on LVT-2s. If they worked they would allow the Marines to outflank Tinian's prepared defenses. General Harry Schmidt was skeptical and ordered that the ramps be put through a 100-vehicle use test. The Seabee creation was named a Doodlebug. It worked exactly as the Marines had hoped. A successful feint for the major settlement of Tinian Town diverted defenders from the actual landing site on the north of the island. The feint withstood a series of night counterattacks supported by tanks, and the 2nd Marine Division landed the next day.