 Between 22 April and 29 May 1943, the Australian 2/7th Infantry Battalion, at the end of a long and tenuous supply line, attacked the southern extremity of Japanese lines in the Mubo area, at features known to the Allies as "The Pimple" and "Green Hill".While the 2/7th made little progress, they provided a diversion for Major George Warfe's 2/3rd Independent Company, which advanced in an arc and raided Japanese positions at Bobdubi Ridge, inflicting severe losses.In May, the 2/7th repelled a number of strong Japanese counterattacks.