The Eagle of Lille expansion to Bloody April (Air War over Arras France 1917) expands the air war to follow the career of Immelmann and some of the other early aces such as Oswald Boelcke and Lanoe Hawker.
Seven new scenarios cover the period from August 1915 to early 1917 while including tables which randomize taskings and add replayability to the scenarios.
14 new Aircraft Data Cards are in this expansion. They include German single seat scout aeroplanes; Fokker Eindecker E.1, Eindecker E.II/E.III and Fokker D.III. German two-seater aeroplanes;
Albatros C.I / C.III and LVG C.II as well as flying battle plane the AEG G.II with a crew of four. The British get a bevy of new aeroplanes; Bristol Scout C, B.E.12, RE.7 and Vickers FB5 Gun Bus as well as French made Morane-Saulnier N, L and BB.