The halberstadt clii was a german two seat escort fighterground attack aircraft of world war i it served in large numbers with the german luftstreitkrfte in 1917 18 the clii proved extremely successful with its excellent maneuverability rate of climb and good armament allowing it to match opposing single seat fighters it was flown by famous german pilots such as paul schwarze and max niemann designed to be used with the popular air combat game system created by andrea angiolino and pier giorgio