Representatives from these and other support and service units had flown to the objective area several days before the Division’s arrival. After completing an inspection of Wonsan, the Shore Party detachment employed 500 North Korean POWs and 210 civilians to improve landing sites and beach exits. This work continued 24 hours a day for nine days, until the vanguard LSTs grated ashore on Kalma Peninsula in the evening of 25 October.[115] At this point, Shore Party Group C (Major George A. Smith) assumed responsibility for YELLOW Beach in the north, and Group B (Major Henry Brzezinski) took over BLUE Beach. [115] The concluding narrative of this chapter is derived from 1stMarDiv _SAR_, annexes MM (hereafter 1stSPBn SAR), 5–8, and UU (hereafter 1st CSG _SAR_) 6 and 1stSPBn, _HD for Advance Party_, 1–2. With the arrival of the first waves of LSTs, LSUs, LVTs, and landing craft in the morning, there began a routine of unremitting toil that would abate only after all of X Corps had landed weeks later. Because of the shallow offshore gradient, many amphibious craft could not reach the beach with their heavy cargoes, and the Shore Party troops had to construct ramps which projected 30 feet into the water. These improvised piers were made of rice bags filled with sand, with the result that their maintenance required considerable effort in men and heavy equipment. A pontoon causeway constructed on 27 October lessened the difficulties connected with getting troops ashore, but other problems persisted. One of these had to do with a sandbar that stretched across the boat lanes about 50 yards from the coast. Heavier craft frequently grounded here, and while some could be towed ashore by tractor dozers (TD-18s) and LVTs, others had to be unloaded in the water by cranes operating off the ramps and from barges. Once men and supplies finally reached dry land, there was the difficulty of transporting them inland over the loose sand and around the sprawling dunes of the peninsular beaches. Trucks and trailers often bogged down to such depths that they had to be uprooted and towed by LVTs or dozers. This tied up the overworked tracked vehicles when they were badly needed elsewhere. The Combat Service Group established its Class I, III, and V dumps according to plan on 26 October, but Class II and IV supplies arrived on the beach “... in a completely mixed condition,” owing to the haste of the outloading at Inchon. From D-Day onward, from 1500 to 2000 Korean civilians were hired daily to help segregate and issue supplies.