page_title: Admiralty Islands campaign
section_title: Securing Seeadler Harbour
hierarchical_section_title: Admiralty Islands campaign / Battle of Los Negros / Securing Seeadler Harbour
caption_attribution_description: Operations on Los Negros, 5-7 March 1944
context_page_description: The Admiralty Islands campaign was a series of battles in the New Guinea campaign of World War II in which the United States Army's 1st Cavalry Division took the Japanese-held Admiralty Islands.
  Acting on reports from airmen that there were no signs of enemy activity and the islands might have been evacuated, General Douglas MacArthur accelerated his timetable for capturing the Admiralties and ordered an immediate reconnaissance in force. The campaign began on 29 February 1944 when a force landed on Los Negros, the third-largest island in the group. By using a small, isolated beach where the Japanese had not anticipated an assault, the force achieved tactical surprise, but the islands proved to be far from unoccupied. A furious battle over the islands ensued.
  In the end, air superiority and command of the sea allowed the Allies to heavily reinforce their position on Los Negros. The 1st Cavalry Division could then overrun the islands. The campaign officially ended on 18 May 1944. The Allied victory completed the isolation of the major Japanese base at Rabaul that was the ultimate objective of the Allied campaigns of 1942 and 1943.
context_section_description: The morning of 4 March saw the arrival of the 2nd Squadron, 7th Cavalry, which relieved the 2nd Squadron, 5th Cavalry. The next day Major General Innis P. Swift, the commander of the 1st Cavalry Division, arrived aboard Bush and assumed command. He ordered the 2nd Squadron, 7th Cavalry to attack across the native skidway. The 2nd Squadron, 5th Cavalry therefore went back into the line to relieve them. While the relief was taking place, the Japanese launched a daylight attack. This was repulsed by the cavalrymen, with the help of artillery and mortar fire, but the American attack was delayed until late afternoon. It then ran into a Japanese minefield and by dawn the advance had only reached as far as the skidway.
  On the morning of 6 March, another convoy arrived at Hyane Harbour: five LSTs, each towing an LCM, with the 12th Cavalry and other units and equipment including five Landing Vehicles Tracked (LVTs) of the 592nd EBSR, three M3 light tanks of the 603rd Tank Company, and twelve 105mm howitzers of the 271st Field Artillery Battalion. The 12th Cavalry was ordered to follow the 2nd Squadron, 7th Cavalry in its advance to the north, and to capture the Salami Plantation. The road to Salami was little more than a muddy track in which vehicles soon became bogged. The Japanese also obstructed the route with ditches, felled trees, snipers, and booby traps. WO2 R. J. Booker of ANGAU used his local knowledge to guide the 12th Cavalry and the three tanks to Salami. Here the Japanese put up a fierce fight that lasted over an hour. The tanks fired canister shot shells into buildings and high-explosive shells into the slits of Japanese bunkers.
  The inhabitants of the area informed the ANGAU detachment the Japanese had retreated across Seeadler Harbour to Papitalai Mission. This, therefore, became the next objective. The 5th Cavalry would attack Papitalai Plantation from the east while the 2nd Squadron, 12th Cavalry would attack Papitalai Mission. The 5th Cavalry captured Porlaka without opposition and crossed Lemondrol Creek in canvas and rubber boats. A patrol under Captain William C. Cornelius fought an estimated 50 Japanese, who ultimately withdrew. Captain Cornelius, who was credited with killing four, was severely wounded and died the next day. He was posthumously awarded the Distinguished Service Cross.
  Because of the coral reef, conventional landing craft could not be used for the landing at Papitalai Mission. The five LVTs, one a combat type and the other four cargo-carrying, set out from Hyane Harbour to Salami Plantation but the road was so bad that only the combat and one cargo LVT were available in time. The attack went ahead anyway, preceded by an airstrike and artillery bombardment by the 271st Field Artillery Battalion. The combat LVT fired 24 M8 4.5-inch rockets. Return fire was received from Japanese mortars and machine guns, and a 75mm howitzer. The first wave had to hold alone in the face of fire from Japanese bunkers for 45 minutes until the LVTs returned with the next wave. Later, they fought off a counterattack by about 30 Japanese. Joined by a third LVT which had eventually managed to make it to Salami, the LVTs made 16 trips across the harbour before nightfall curtailed operations, transporting part of the 2nd Squadron, 12th Cavalry, along with rations, water and ammunition, and evacuating the dead and wounded.
  Colonel Ezaki reported the American attack on Papitalai Mission to the Eighth Area Army in Rabaul, promising a night counterattack on the position; but no attack was delivered. The Japanese withdrew, and no further messages were ever received from Colonel Ezaki.
  The task of silencing the Japanese guns guarding Seeadler Harbour fell to Rear Admiral Victor Crutchley's Task Force 74 (TF74), consisting of the heavy cruiser HMAS Shropshire, light cruisers USS Phoenix and Nashville, and destroyers USS Bache, Beale, Daly, and Hutchins. They bombarded Hauwei Island for an hour on 4 March but on 6 March USS Nicholson was struck by a Japanese shell fired from Hauwei. With minesweepers scheduled to attempt to e
caption: Operations on Los Negros, 5–7 March 1944
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