Following the fighting around Roosevelt Ridge, the Allied advance on Salamaua continued. Mount Tambu was secured on 18 August, and operations in the area continued through the final week of August. The capture of Roosevelt Ridge enabled Allied artillery observers to control fires more effectively around Salamaua and in the days following they began shelling Tambu Bay heavily, while patrols were pushed forward of the ridge with a view to eventually clearing the Japanese from the Scout Ridge junction and pushing north of Roosevelt Ridge. Around the same time, the Allies launched a seaborne landing near Lae and an airborne landing at Nadzab as part of an operation to secure Lae, which Allied planners considered more important than Salamaua itself. Pressure had been maintained on Salamaua in an effort to try to draw reinforcements away from Lae; however, as the Lae operation developed, the Japanese moved about 5,000 to 6,000 troops away from Salamaua by sea, abandoning the badly bomb damaged town.