Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Type 11 75 mm AA Gun (åä¸€å¹´å¼ä¸ƒç³ŽåŠé‡Žæˆ¦é«˜å°„ç ², JyÅ«ichinen-shiki nana-senti-han Yasen KoshahÅ?) was an anti-aircraft gun used by the Imperial Japanese Army after World War I. It was the first anti-aircraft gun in Japanese service, but only a small number were produced, and it was superseded by the Type 14 10 cm AA Gun and the Type 88 75 mm AA Gun in active service before the start of World War II.Due to combat experience at the Battle of Tsingtao against the German Luftwaffe''s fledgling squadron of combat aircraft, planners on the Imperial Japanese Army General Staff quickly realized that this new technology posed a threat which required countermeasures. This evaluation was further reinforced by reports from military observers on the European front in World War I.