The campaign was preceded by an amphibious landing by troops from the Australian 9th Division east of Lae on 4 September 1943. This was followed by an advance west along the coast towards the town where they were to link up with 7th Division advancing from Nadzab. Meanwhile, Australian and US forces mounted diversionary attacks around Salamaua. Heavy rain and flooding slowed the 9th Division's advance, which had to cross several rivers along the way. The Japanese rear guard also put up a stiff defence and, as a result, Lae did not fall until 16 September, when troops from the 7th Division entered it ahead of the 9th, and the main body of the Japanese force escaped north. Less than a week later, the Huon Peninsula campaign was opened as the Australians undertook another amphibious landing further east, aimed at capturing Finschhafen.