In September 1944, Major Nowotny was put in charge of Kommando Nowotny, equipped with the Me 262 jet fighter. The unit consolidated a number of test units and was tasked with acquiring tactical knowledge and experience of Me 262 operations. The unit was based on two airfields northwest of Osnabrück: Achmer and Hesepe. Nowotny was besieged with difficulties in operationally testing the jet fighter. In addition to staving off the increasing Allied fighter presence the jets attracted, he was also beset with the technical difficulties a new and immature technology presented. By 7 November 1944, Nowotny had claimed three victories in the new jet fighter. Nowotny took off on 8 November 1944, flying against USAAF bombers with a fighter escort. The exact circumstances of Nowotny’s death remain uncertain. Ground personnel reported hearing combat above the clouds. Nowotny reported he had downed a B-24 four-engine bomber and probably destroyed a P-51 fighter. He then reported an engine failure before making a garbled transmission referring to “burning” over the radio. His Me 262 A-1a (W.Nr. 110 400) “White 8” was seen to dive vertically out of the clouds and crash at Epe, 2.5 kilometres east of Hesepe. It is generally accepted that he was shot down by 1st Lt Edward “Buddy” Haydon of the 357th Fighter Group, USAAF and Capt Ernest “Feeb” Fiebelkorn (9 victories) of the 20th Fighter Group, USAAF whom shared a Me 262 victory at 12:45 over Achmer that day.
http://www.luftwaffe.cz/nowotny.html At 12:45 P.M., November 8, 1944, 1st Lt. Edward R. Haydon, flying his P-51D "Lady Nelda" of the 357th Fighter Group, joined P-51s of the 20th Fighter Group in the chase of a crippled Me 262 towards its airfield at Achmer, Germany. The German fighter pilot dragged his pursuers into a barrage of flak put up by the airfield defenses. All 20th Fighter Group P-51s broke away to the right. Lt. Haydon broke to the left, alone, to find the Me 262 on the downwind leg for landing. As Haydon continued his turn towards firing position, the German pilot caught sight of him and reacted violently, snapping inverted, diving into the ground right under the P-51’s nose. Haydon had not fired a shot. He was awarded the victory, though it was shared with Capt. Ernest C. Fiebelkorn of the 20th Fighter Group, who had fired at Nowotny during the chase.*
http://www.people.virginia.edu/~rjr/avart/waryears/