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The task force reached Rabaul on 11 September, where they found the port to be free of German forces. Sydney and the destroyer HMAS Warrego landed small parties of naval reservists at the settlements of Kabakaul and at Herbertshöhe. These parties were reinforced firstly by sailors from Warrego and later by infantry from Berrima. Two parties were subsequently landed, one under Sub-Lieutenant C. Webber and the other commanded by Lieutenant Commander J.F. Finlayson. In accordance with German plans, the Australians encountered no opposition at Herbertshöhe, with the German company stationed there having withdrawn to Takubar—between Herbertshöhe and Kabakaul—in the early morning. At 07:00, the Australians raised the Union Jack over the settlement.
The Australians believed there were probably two radio stations, one under construction 4 miles (6.4 km) directly inland from Herbertshöhe and the other directly inland from Kabakaul, at Bita Paka. Finlayson remained at Herbertshöhe to guard the stores being landed from Sydney, while Webber's party began an advance from Herbertshöhe inland along the Toma road. Another party under Lieutenant Rowland Bowen would advance towards Bita Paka, 7 kilometres (4.3 mi) to the south. Bowen's force, consisting of two officers and 25 naval reservists was subsequently landed at Kabakaul. Also included were about 15 other personnel to provide medical support and maintain communications. The advance inland began along the fringe of the dense jungle-edged road to the radio station, with the Australians attempting to avoid the road wherever possible. By 09:00 they had penetrated about 2,000 yards (1,800 m) and with the scrub becoming denser, the scouts pushed away from the road to work their way around the obstacle. They suddenly surprised a group of about 20 Melanesian soldiers led by three German reservists, who were apparently laying an ambush on the road for the advancing Australians. They opened fire, wounding one German in the hand and capturing him, and scattering the Melanesians. By means of a ruse Wuchert and Mayer were also captured, depriving the defenders of two important commanders, while several significant maps also fell into Australian hands at this time.
Realising that his advance was going to be contested, Bowen requested reinforcements. Consequently, as an interim measure, 59 men from Warrego and Yarra were landed under Lieutenant G.A. Hill, until infantry could arrive from Berrima, which was still steaming towards Kabakaul from Karavia Bay. Meanwhile, Bowen pushed on and the Australians were again fired upon by the well concealed Germans and their Melanesian troops, as well as by snipers in the treetops. By 09:30 the situation had become grave, and the Australians suffered their first casualty of the war, with Able Seaman Billy Williams mortally wounded.