 Complete the following phrase:  With the outbreak of the War of Resistance-World War II following the a hrefMarco20Polo20Bridge20Incident77 Incidenta in 1937, Liangshan Airfield, as it became known as, was integrated along with the warlord aircraft assets and personnel into the centralized command of the nominally Nationalist Air Force of China; Liangshan Airfield served in defense of Sichuan as well as launching fighters on escort missions for bombing runs against Japanese positions in Hubei. Liangshan Airfield served as a forward air force base stationing the 24th PS, 4th PG which regularly engaged attacks by the Imperial Japanese Navy Air Force and Army Air Force in the 