The planes had barely disappeared when naval gunfire resumed, carpeting the beach areas with a building crescendo of high-explosive shells. The ship-to-shore movement was well underway, an easy 30-minute run for the tracked landing vehicles (LVTs). This time there were enough LVTs to do the job: 68 LVT(A)4 armored amtracs mounting snub-nosed 75mm cannon leading the way, followed by 380 troop-laden LVT 4s and LVT 2s. The waves crossed the line of departure on time and chugged confidently towards the smoking beaches, all the while under the climactic bombardment from the ships. Here there was no coral reef, no killer neap tides to be concerned with. The Navy and Marine frogmen had reported the approaches free of mines or tetrahedrons. There was no premature cessation of fire. The “rolling barrage” plan took effect. Hardly a vehicle was lost to the desultory enemy fire. The massive assault waves hit the beach within two minutes of H-hour. A Japanese observer watching the drama unfold from a cave on the slopes of Suribachi reported, “At nine o’clock in the morning several hundred landing craft with amphibious tanks in the lead rushed ashore like an enormous tidal wave.” Lieutenant Colonel Robert H. Williams, executive officer of the 28th Marines, recalled that “the landing was a magnificent sight to see--two divisions landing abreast; you could see the whole show from the deck of a ship.” To this point, so far, so good. The first obstacle came not from the Japanese but the beach and the parallel terraces. Iwo Jima was an emerging volcano; its steep beaches dropped off sharply, producing a narrow but violent surf zone. The soft black sand immobilized all wheeled vehicles and caused some of the tracked amphibians to belly down. The boat waves that closely followed the LVTs had more trouble. Ramps would drop, a truck or jeep would attempt to drive out, only to get stuck. In short order a succession of plunging waves hit the stalled craft before they could completely unload, filling their sterns with water and sand, broaching them broadside. The beach quickly resembled a salvage yard. [Illustration: LANDING PLAN IWO JIMA E.L. Wilson ] The infantry, heavily laden, found its own “foot-mobility” severely restricted. In the words of Corporal Edward Hartman, a rifleman with the 4th Marine Division: “the sand was so soft it was like trying to run in loose coffee grounds.” From the 28th Marines came this early, laconic report: “Resistance moderate, terrain awful.”