Operation Bellicose was an attack by Avro Lancaster bombers of the Royal Air Force on a German radar factory housed in the former Zeppelin Works at Friedrichshafen and the Italian naval base at La Spezia. It was the first shuttle bombing raid in the Second World War and the second use of a Master Bomber. In early June 1943, a Central Interpretation Unit photo interpreter (Claude Wavell) identified a stack of ribbed baskets (Würzburg radar reflectors) at the Zeppelin Works. After Winston Churchill viewed the photos at RAF Medmenham on 14 June, No. 5 Group RAF received the surprise orders on 16 June to attack Friedrichshafen during the next full moon.