day in the tragic chapters of the Chinese Air Force in the war, as eight pilots were killed, including top-ace fighter pilots Maj. John Huang Xinrui and Capt. Cen Zeliu, along with the young 2nd Lt. Lin Heng (younger brother of renowned architect Phyllis Lin Huiyin). In response to the Japanese invasion of French Indochina, the Empire of Japan was finally met with the U.S. scrap metal and oil embargo against Japan and the freezing of Japanese assets in summer of 1941. On 5 June 1941, in midst of the increased brutality of the new Operation 102 bombing campaign to force the Chinese to capitulate in their war of resistance, the Japanese flew more than 20 sorties, bombing the city for three hours. About 4,000 residents who hid in a tunnel were asphyxiated. With the start of full-scale war between the Soviet Union and Nazi Germany on 22 June 1941, and with Generalissimo Chiang Kai-shek looking for increased support from the Americans through the Lend-Lease Act of which was extended to China on 6 May 1941, all new fighter aircraft produced by the Soviets were now directed to the battlefronts against Nazi Germany. On 11 August 1941, in what would be the last-recorded dogfight between the Chinese Air Force fighters and the IJNAF Zeroes before all active Zero squadrons were pulled out of China in preparations for Operation Z (the Pearl Harbor attack mission), future Japanese ace-fighter pilots Gitaro Miyazaki and Saburō Sakai were part of the escort of an Operation 102 bomber attack and fighter sweep of Chinese air bases between Chongqing and Chengdu, and encountered Chinese I-153 and I-16 fighters at Wenjiang Airbase; while shooting down all those that managed to take off or strafing those still taxiing down the runways, Saburo Sakai described how five Zeroes then struggled to shoot down the one last opponent still in the air that "was an absolute master" as it "snap-rolled, spiralled, looped and turned through seemingly impossible maneuvers... like a wraith", but Sakai himself only managed to finally shoot down the acrobatic biplane fighter pilot when he was forced to slow-roll in a climb while trying to clear over the top of a hill west of Chengdu. The belly of the Chinese fighter suddenly exposed right into the gunsight of Sakai's Zero, who fired cannon shells that "tore through the floorboards of the biplane", sending it down in a wide