In 1915 the armies of the Great War were locked in a stalemate of the trenches but a new form of combat would soon put an end to stationary battles - the aerial duel. Almost from its conception air-warfare captured the popular imagination, turning men into heroes, pilots into Fighter Aces. High above the trenches the courage and skill of men such as Baron Von Richthofen, Oswald Boelcke, Edward 'Mick' Mannock, Billy Bishop and Hermann Goering would make them legends in their own lifetime. During the Spanish Civil War a new generation of German Aces won its spurs, with the tactics and machines being perfected for the forthcoming "Blitzkrieg". Throughout the Battle of Britain the hastily trained fighter pilots of the RAF learnt tactics "on the wing" against the Luftwaffe veterans of Spain. The heroisms and determination of the RAF Aces such as Joseph Frantichek and Ginger Lacey were all that stood between Britain and invasion.