spin and exploding as it hit the hillside. Four Chinese pilots were killed in this engagement, including Lt. Huang Rongfa, whose fiancée, Ms. Yang Quanfang, took a pistol and shot herself at the memorial for him and the other martyrs on the 16th of August; under these special circumstances, the remains of Ms. Yang and Lt. Huang were buried together at the Chongqing Nanshan Air Force Martyrs Memorial Park. On 30 August 1941, Lt. General Saburo Endo, commander of the Imperial Japanese Army's 3rd Sentai, having already received intelligence reports regarding an upcoming military conference in Chongqing held by Generalissimo Chiang Kai-shek, and the precise location for it, led a massive strike from Wuhan consisting of 205 bomber-attack planes, with Saburo Endo himself personally leading the assassination strike on Yunxiu Villa (specifically the Yunxiu Tower); at first, it made a low-level bombing run for accuracy, but was severely hampered by intense bursts of anti-aircraft fire that, according to him, "knocked me up away from my seat several times", and then having to increase altitude to 5,500 meters to make the bombing run instead, killing two guards west of Yunxiu Tower, but failing to kill the Generalissimo, who recorded in his diary how he felt the immense shocks of the bombing and suffering of the people who experienced the torment not just day and night, but for over four years. Following the Japanese attack on Pearl Harbor in December 1941, the United States declared war on Japan, and President Roosevelt sought an immediate counterattack for the humiliation of Pearl Harbor; in the urgency to keep China resupplied for the new Sino-US joint effort in the war against Japan, General Joseph Stilwell was sent to Generalissimo Chiang Kai-shek on a top secret arrangement for the transfer of North American B-25 Mitchell bomber support equipment, radio-homing navigational aids and 100-octane avgas into China to support the planning of what was to become the Doolittle Raid against the Japanese home islands. The badly needed high-octane avgas and new equipment in China for the renewed war effort against the Empire of Japan were now increasingly being freighted via the risky Himalayan air-route known as "The Hump". As Japan's focus shifted towards the Pacific campaign, and much of the Japanese aerial-combat assets and experienced personnel had been diverted to support the war in the Pacific, the offensive campaign against Chonqing and Chengdu had been significantly curtailed;