The Japanese struck first, landing at Buna in July, and at Milne Bay in August. The Australians repulsed the Japanese at Milne Bay, but a series of defeats in the Kokoda Track campaign had a depressing effect back in Australia. On 30 August, MacArthur radioed Washington that unless action was taken, New Guinea Force would be overwhelmed. He sent Blamey to Port Moresby to take personal command. Having committed all available Australian troops, MacArthur decided to send American forces. The 32nd Infantry Division, a poorly trained National Guard division, was selected. A series of embarrassing reverses in the Battle of Buna–Gona led to outspoken criticism of the American troops by the Australians. MacArthur then ordered Lieutenant General Robert L. Eichelberger to assume command of the Americans, and "take Buna, or not come back alive".