According to US historian David T. Zabecki, Ehrler was credited with 208 aerial victories.[1] While Spick lists Ehrler with 209 aerial victories claimed in an unknown number of combat missions. Of these, ten were claimed over the Western Allies and the remaining 199 on the Eastern Front.[2] Obermaier lists him with 208 aerial victories claimed in over 400 combat missions.[3] Mathews and Foreman, authors of Luftwaffe Aces – Biographies and Victory Claims, researched the German Federal Archives and state that Ehrler was credited with more than 182 aerial victories. This figure includes at least 173 claims made on the Eastern Front and 9 on the Western Front, including seven four-engined bombers and eight victories with the Me 262 jet fighter. However, the authors indicate that the records for JG 5 are incomplete. They speculate that the actual number of confirmed victories could also be as low as 150 to 175.[4]
Victory claims were logged to a map-reference (PQ = Planquadrat), for example "PQ 36 Ost AG". The Luftwaffe grid map (Jägermeldenetz) covered all of Europe, western Russia and North Africa and was composed of rectangles measuring 15 minutes of latitude by 30 minutes of longitude, an area of about 360 square miles (930 km2). These sectors were then subdivided into 36 smaller units to give a location area 3 km × 4 km (1.9 mi × 2.5 mi) in size.[5]
♠ (Ace of spades) indicates those aerial victories which made Ehrler an "ace-in-a-day", a term which designates a fighter pilot who has shot down five or more aeroplanes in a single day. ? (question mark) indicates information discrepancies listed by Prien, Stemmer, Balke, Bock, Mombeek, Mathews and Foreman.
According to Mathews and Foreman, aerial victories 56 to 58 were not documented.[23] According to Mombeek, Ehrler claimed three aerial victories of unknown type on 31 August 1942 labelled as victories 56 to 58.[25]
Mathews, Andrew Johannes; Foreman, John (2014). Luftwaffe Aces – Biographies and Victory Claims – Volume 1 A–F. Walton on Thames: Red Kite. ISBN978-1-906592-18-9.
Mombeek, Eric (2011). Eismeerjäger—Zur Geschichte des Jagdgeschwaders 5—Band 4 [Fighters in the Arctic Sea—The History of the 5th Fighter Wing—Volume 4]. Linkebeek, Belgium: ASBL, La Porte d'Hoves. ISBN978-2-930546-05-6.
Obermaier, Ernst (1989). Die Ritterkreuzträger der Luftwaffe Jagdflieger 1939 – 1945 [The Knight's Cross Bearers of the Luftwaffe Fighter Force 1939 – 1945] (in German). Mainz, Germany: Verlag Dieter Hoffmann. ISBN978-3-87341-065-7.
Prien, Jochen; Stemmer, Gerhard; Rodeike, Peter; Bock, Winfried (2003a). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 5—Heimatverteidigung—10. Mai 1940 bis 31 Dezember 1941—Einsatz im Mittelmeerraum—Oktober 1940 bis November 1941—Einsatz im Westen—22. Juni bis 31. Dezember 1941—Die Ergänzungsjagdgruppen—Einsatz 1941 bis zur Auflösung Anfang 1942 [The Fighter Units of the German Air Force 1934 to 1945—Part 5—Defense of the Reich—10 May 1940 to 31 December 1941—Action in the Mediterranean Theater—October 1940 to November 1941—Action in the West—22 June to 31 December 1941—The Supplementary Fighter Groups—Action from 1941 until their Breakup in Early 1942] (in German). Eutin, Germany: Struve-Druck. ISBN978-3-923457-68-7.
Prien, Jochen; Stemmer, Gerhard; Rodeike, Peter; Bock, Winfried (2003b). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 6/II—Unternehmen "BARBAROSSA"—Einsatz im Osten—22.6. bis 5.12.1941 [The Fighter Units of the German Air Force 1934 to 1945—Part 6/II—Operation "BARBAROSSA"—Action in the East—22 June to 5 December 1941] (in German). Eutin, Germany: Struve-Druck. ISBN978-3-923457-70-0.
Prien, Jochen; Stemmer, Gerhard; Rodeike, Peter; Bock, Winfried (2006). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 9/III—Vom Sommerfeldzug 1942 bis zur Niederlage von Stalingrad—1.5.1942 bis 3.2.1943 [The Fighter Units of the German Air Force 1934 to 1945—Part 9/III—From the 1942 Summer Campaign to the Defeat at Stalingrad—1 May 1942 to 3 February 1943] (in German). Eutin, Germany: Struve-Druck. ISBN978-3-923457-78-6.
Prien, Jochen; Stemmer, Gerhard; Rodeike, Peter; Bock, Winfried (2012). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 12/I—Einsatz im Osten—4.2. bis 31.12.1943 [The Fighter Units of the German Air Force 1934 to 1945—Part 12/I—Action in the East—4 February to 31 December 1943] (in German). Eutin, Germany: Buchverlag Rogge. ISBN978-3-942943-02-4.
Prien, Jochen; Stemmer, Gerhard; Bock, Winfried; Balke, Ulf (2020). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 13/VI—Einsatz im Reichsverteidigung und im Westen—1.1. bis 31.12.1944 [The Fighter Units of the German Air Force 1934 to 1945—Part 13/VI—Action in the Defense of the Reich and in the West—1 January to 31 December 1944] (in German). Eutin, Germany: Struve-Druck. ISBN978-3-942943-22-2.
Prien, Jochen; Stemmer, Gerhard; Balke, Ulf; Bock, Winfried (2022). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 15/I—Einsatz im Osten—1.1. bis 31.12.1944 [The Fighter Units of the German Air Force 1934 to 1945—Part 15/I—Action in the East—1 January to 31 December 1944] (in German). Eutin, Germany: Buchverlag Rogge. ISBN978-3-942943-26-0.