sentences:  None of the twelve aircraft ordered was completed by the time of the Operation Weserübung the German Invasion of Denmark in 1940.The P.4/34 would serve as the basis for a two-seat, long-range, carrier-based fighter for the Fleet Air Arm to meet the requirements of Specification O.8/38.The second prototype P.4/34 (serial "K7555") was modified with, among other things, a reduced-span wing and lowered tailplane as an aerodynamic prototype for the Fulmar.