 On 1 September 1939, the "Wehrmacht" (German Armed Forces) invaded Poland beginning World War II.By the time of the war, the OKL had resolved some of the crucial issues facing their service as it transitioned to the next generation of aircraft in 1937 and 1938.German anti-aircraft forces, airborne forces ("Fallschirmjäger") and close support capabilities allowed it to make an impact other European powers could not match in 1939.