With the beginning of World War II at the Battle of Shanghai and Nanjing in 1937, the story develops around the Chinese Air Force's great resistance against the Japanese invasion and occupation of China; the overwhelming might of the Imperial Japanese war machine taking down Shanghai and the wartime capital of Nanjing, followed by heavy resistance and eventual fall of the interim wartime capital of Wuhan in 1938, and climaxing into the bloody six years-long all-airwar Battle of Chongqing, the wartime capital of China for the remainder of World War II, with the remnants of the Chinese Air Force, the refugees, and the people of Chongqing exemplifying the undying resilience against years of barbaric air strikes by the Imperial Japanese air power.