 Support for the 26th Brigade 's attack would be provided by divisional assets , including Matilda tanks from ' C ' Squadron , 1st Tank Battalion , whose presence the Australians took great lengths to keep secret , artillery from the 2 / 12th Field Regiment and later ( after it was found that the 25 @-@ pdrs could not be transported up the Sattelberg Road ) , the 2nd Mountain Battery , and support @-@ by @-@ fire from the 2 / 2nd Machine Gun Battalion . The 2 / 13th Field Company supplied engineer detachments to each battalion , while air assets were provided by the United States 5th Air Force and No. 4 Squadron , Royal Australian Air Force , which was an Army co @-@ operation squadron that was equipped with Boomerangs and Wirraways , and provided aerial observation in support of artillery operations . Vengeance dive bombers from No. 24 Squadron , RAAF also provided support , while Japanese supply lines were disrupted by Allied aircraft and PT boats . 
