The warships then shifted their attention to the assault beaches, and the landing craft carrying the two battalions of Colonel Julian N. Frisbie's 7th Marines started shoreward. An LCI [Landing Craft, Infantry] mounting multiple rocket launchers took position on the flank of the first wave bound for each of the two beaches and unleashed a barrage intended to keep the enemy pinned down after the cruisers and destroyers shifted their fire to avoid endangering the assault troops. At 0746, the LCVPs [Landing Craft, Vehicles and Personnel] of the first wave bound for Yellow Beach 1 grounded on a narrow strip of black sand that measured perhaps 500 yards from one flank to the other, and the leading elements of the 3d Battalion, commanded by Lieutenant Colonel William K. Williams, started inland. Two minutes later, Lieutenant Colonel John E. Weber's 1st Battalion, on the left of the other unit, emerged on Yellow Beach 2, separated from Yellow 1 by a thousand yards of jungle and embracing 700 yards of shoreline. Neither battalion encountered organized resistance. A smoke screen, which later drifted across the beaches and hampered the approach of later waves of landing craft, blinded the Japanese observers on Target Hill overlooking the beachhead, and no defenders manned the trenches and log-and-earth bunkers that might have raked the assault force with fire. [Illustration: POSITIONS OF THE FIRST MARINE DIVISION] The Yellow Beaches, on the east coast of the broad peninsula that culminated at Cape Gloucester, provided access to the main objective, the two airfields at the northern tip of the cape. By capturing this airfield complex, the reinforced 1st Marine Division, designated the Backhander Task Force, would enable Allied airmen to intensify their attack on the Japanese fortress of Rabaul, roughly 300 miles away at the northeastern extremity of New Britain. Although the capture of the Yellow Beaches held the key to the New Britain campaign, two subsidiary landings also took place: the first on 15 December at Cape Merkus on Arawe Bay along the south coast; and the second on D-Day, 26 December, at Green Beach on the northwest coast opposite the main landing sites. [Illustration: SEIZURE AND DEFENSE OF THE AIRDROME] [Sidenote: Major General William H. Rupertus Major General William H. Rupertus, who commanded the 1st Marine Division on New Britain, was born at Washington, D.C., on 14 November 1889 and in June 1913 graduated from the U.S. Revenue Cutter Service School of Instruction. Instead of pursuing a career in this precursor of the U.S. Coast Guard, he accepted appointment as a second lieutenant in the Marine Corps. A vigorous advocate of rifle marksmanship throughout his career, he became a member of the Marine Corps Rifle Team in 1915, two years after entering the service, and won two major matches. During World War I, he commanded the Marine detachment on the USS _Florida_, assigned to the British Grand Fleet.