On 14 August 1937, thirteen Japanese heavy bombers attacked the Chienchiao airfield at Hangchow, and six of them were shot down by the 4th fighter squadron under squadron leader Kao Chih-hang.
民國廿六年八月十四日，十三架日本重轟炸機進襲杭州筧橋機場，被高志航隊長率領的第四大隊擊落六架。