The concept of a twin-engine fighter that could accompany bomber formations and effectively drive off defending fighters was the rationale behind the creation of the Messerschmitt Bf 110. Initial operations during 1939–40 seemed to justify its existence, but the generally weak level of aerial opposition bred a false sense of security among the aircrews that was thoroughly blunted during the Battle of Britain. Better fortune attended the Zerstorer's (Destroyer) operational career when utilised in two alternative ways. First, it proved a steady platform for ground-attack duties, given its heavy cannon and machine gun battery. Even more effective was the switch to a night fighter function, where it proved a deadly weapon along with its Ju 88 contemporary in Germany's Home Defense against the nocturnal operations launched by RAF Bomber Command. Part of the Legends of Warfare series. AUTHOR: Ron Mackay's literary career in WWII aviation history has spanned four decades, with coverage of the Royal Air Force, Luftwaffe, and USAAF being completed in almost equal measure. SELLING POINTS: . A concise, pictorial history of the Bf 110's operational career during WWII . Combat service with the German Luftwaffe over all European war fronts . A day fighter that was subsequently transformed into a highly effective, and deadly, night fighter 200 colour and b/w photographs