Operations on Los Negros had now reached the mopping-up stage, but an estimated 2,700 Japanese troops remained on Manus. General Swift decided to land Brigadier General Verne D. Mudge's 2nd Brigade at Lugos Mission, west of Lorengau. Lorengau, known to be heavily fortified, was an important objective. It had an airfield, and four roads converged there. As a preliminary, the 302nd Cavalry Reconnaissance Troop was ordered to locate sites from which the artillery could cover landings on Manus. Three patrols were sent out by LCVP on 11 March. The first found Bear Point on Manus free of Japanese but lacking sites for artillery emplacements. The second scouted the Butjo Luo Islands. They found the islands apparently unoccupied, with good sites on the northern island. The third patrol, 25 officers and men of the 302nd Cavalry Reconnaissance Troop, two officers from the 99th Field Artillery Battalion, with WO2 A. L. Robinson of ANGAU and Kaihu, a native of Mokerang, as guides, set out for Hauwei in an LCVP, escorted by PT 329, one of the PT boats now operating from the tender in Seeadler Harbour.