This force was commanded by Brigadier General William C. Chase, commander of the 1st Brigade, 1st Cavalry Division. It included the three rifle troops and the heavy weapons troop of the 2nd Squadron, 5th Cavalry; a platoon from Battery B, 99th Field Artillery Battalion with two 75 mm pack howitzers; the 673rd Anti-Aircraft Machine Gun Battery (Airborne); and 29 Australians of the Australian New Guinea Administrative Unit (ANGAU), who were to assist in gathering intelligence and dealing with the native population, some 13,000 of whom lived in the islands. Once the decision to remain was known, a follow-up force with the rest of the 5th Cavalry and 99th Field Artillery Battalion, 40th Naval Construction Battalion, and 2,500 measurement tons of stores would depart from Finschhafen in six Landing Ships, Tank (LSTs), each towing an LCM of Company E, 592nd EBSR. When an aide expressed concern over assigning such a hazardous mission to a unit without combat experience, General MacArthur recalled how the 5th Cavalry had fought alongside his father's troops in the campaign against Geronimo. "They'd fight then," he said, "and they'll fight now."