During the first few months of the war against the United States following the attack on Pearl Harbor, Japan planned to use biological weapons against Americans. During the Philippines campaign in March 1942, the Japanese considered releasing 90 kg (200 lbs) of plague-carrying fleas (about 150 million insects) in each of ten separate attacks, but the Americans surrendered at Bataan before the plan was implemented. Around November 1944, Japan launched a total of 9,300 incendiary and antipersonnel bombs carried by balloons which were designed to rise to 10,000 m (30,000 ft), and then be swept eastward by the jet stream to the Continental United States. They killed six American civilians near Bly, Oregon; crashed into a farm in Medford, Oregon; and caused a short circuit in the power lines supplying electricity for the nuclear reactor cooling pumps in the Manhattan Project's production facility at the Hanford Site in Washington. A backup system restored power. During the Battle of Iwo Jima, another biological attack was considered against the invading Americans. Pilot Shoichi Matsumoto later recounted how two gliders carrying pathogens were supposed to be towed over the battle and released, but the gliders that were supposed to take off from Mainland Japan to Matsumoto's airfield in Pingfang District in preparation for the attack never reached their destination.