 Complete the following phrase:  As veteran Second Australian Imperial Force formations including Brigadier Arnold Potts 21st Brigade arrived from Australia to reinforce Maroubra Force, the first major action of the campaign took place around Isurava. This was followed by actions around Templetons Crossing, Efogi and Ioribaiwa as the Japanese penetrated as far south as Imita Ridge, which was only a short distance from Port Moresby. In late September and early October, after reverses around 