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. Oberleutnant Thierfelder was appointed Staffelkapitän of 1./ZG 26 on 19 July 1941.
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On 18 july, in the aircombat over Staraya Russa airfield, I-153's of 38iap shot down and killed Gr.Kdr. I./ZG26 Hptm. Horst Lehrmann. StaKa 1./ZG26, Oblt Wilhelm Spiess took over I./ZG26, and Oblt. Thierfelder became StaKa 1./ZG26.
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On 7 August he was transferred as Staffelkapitän to 6./ZG 26.
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But already on 10 augest 1941, in aircombat over Kingisepp, soviet fighter ramm Bf110 of StaKa 6./ZG26, Oblt. Alfred Möll, who was killed in his crippled aircraft. Oblt Thierfelder took his place as StaKa 6./ZG26.
He led his Staffel through hardest battles on the way to Leningrad, and got great success, such as attack on airfield of 5iap VVS KBF, when pilots of II./ZG26 destroyed 33 aircrafts on the ground and damaged more 13, plus shot down 3 in the air.
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Hauptmann Thierfelder was transferred to the Geschwaderstab of ZG 2 on 1 May 1942.
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On 31 april 1942, ZG26 was disbanded and absorbed by ZG1 and ZG2.
Maj. von Rettberg, ex-Gr.Kdr. of II./ZG26, took one of his best StaffelKapitane with him to Stab./ZG2, when was appointed Komodore ZG2.
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On 1 July he was appointed Staffelkapitän of 4./ZG 2 although in August 1942 he was transferred as Staffelkapitän to 5./ZG 2.
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He took the post of StaKa 4./ZG2 after Hptm. Paul Matuscheck, and after that was appointed StaKa 5./ZG2 after Hptm. Oskar Gehring, who was transferred to I./ZG1.
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On 1 October he was transferred to the Stab of General der Jagdflieger on orders of Generalmajor Adolf Galland (104 victories, RK-Br) where he was placed in charge of various experimental units.
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After ZG2 was disbanded, he moved to Stab duty.
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He was appointed Kommandeur of Erprobungskommando 262 tasked with the evolution of suitable tactics for the Me 262 jet fighter on 15 December 1943.
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As zerstorer ace, familiar with two engined heavy aircrafts, he was posted to test new Me262 heavy two engined fighter,
jet zerstorer.
On 2.6.44, III./ZG26 gave last 14 servicable Bf110's to other units and became first ZerstoreGruppe, equipped with Me262. Obstlt Johann Kogler, who led Gruppe in last 3 months of hardest RVT dutyes, was appointed to Geschwader Komodore, and Hptm. Thierfelder took over III./ZG26, and used his expirience of Me262 flying to teach his pilots.
Unfortunatly, he was killed in his first combat mission on 18.7.44.