Grollmus was born on 8 January 1918 in Lissa, at the time in the Province of Posen, a province of the Kingdom of Prussia. Today Lissa is Leszno in western Poland. Following flight training, Grollmus was posted to the Ergänzungsjagdgruppe of Jagdgeschwader 54 (JG 54—54th Fighter Wing), a supplementary training group, in November 1941.[3] On 9 March 1942, the Ergänzungsgruppe of JG 54 was disbanded and the pilots were transferred to I. Gruppe (1st group) of JG 54.[4] In consequence, Grollmus was transferred to 2. Staffel of JG 54.[5] As part of a Luftwaffe plan to exchange fighter units operating on the Eastern Front with fighter units flying on the Western Front, Grollmus was assigned to 12. Staffel of JG 54 in July 1943 which had been newly formed from elements of 7. Staffel of Jagdgeschwader 26 "Schlageter" (JG 26—26th Fighter Wing) and 4. Staffel of JG 54 and was subordinated to II. Gruppe of JG 54.[6]
According to Spick, Grollmus was credited with 75 aerial victories claimed in an unknown number missions on the Eastern Front.[7] Heaton, Lewis, Olds and Schulze also list him with 75 aerial victories.[9] Mathews and Foreman, authors of Luftwaffe Aces — Biographies and Victory Claims, researched the German Federal Archives and found records for 68 aerial victory claims, all of which claimed on the Eastern Front.[10]
Victory claims were logged to a map-reference (PQ = Planquadrat), for example "PQ 10163". 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.[11]
Chronicle of aerial victories
This and the ♠ (Ace of spades) indicates those aerial victories which made Grollmus an "ace-in-a-day", a term which designates a fighter pilot who has shot down five or more airplanes in a single day.
This and the ? (question mark) indicates information discrepancies listed by Prien, Stemmer, Rodeike, Balke, Bock, Mathews and Foreman.
Claim
Date
Time
Type
Location
Claim
Date
Time
Type
Location
– 1. Staffel of Ergänzungsgruppe/Jagdgeschwader 54 –[12] Eastern Front — 6 December 1941 – 9 March 1942
Fellgiebel, Walther-Peer[in German] (2000) [1986]. Die Träger des Ritterkreuzes des Eisernen Kreuzes 1939–1945 — Die Inhaber der höchsten Auszeichnung des Zweiten Weltkrieges aller Wehrmachtteile [The Bearers of the Knight's Cross of the Iron Cross 1939–1945 — The Owners of the Highest Award of the Second World War of all Wehrmacht Branches] (in German). Friedberg, Germany: Podzun-Pallas. ISBN978-3-7909-0284-6.
Heaton, Colin D.; Lewis, Anne-Marie; Olds, Robin; Schulze, Kurt (2011). The German Aces Speak: World War II Through the Eyes of Four of the Luftwaffe's Most Important Commanders. Voyageur Press. ISBN978-1-61059-748-7.
Mathews, Andrew Johannes; Foreman, John (2015). Luftwaffe Aces — Biographies and Victory Claims — Volume 2 G–L. Walton on Thames: Red Kite. ISBN978-1-906592-19-6.
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.
Patzwall, Klaus D.; Scherzer, Veit (2001). Das Deutsche Kreuz 1941 – 1945 Geschichte und Inhaber Band II [The German Cross 1941 – 1945 History and Recipients Volume 2] (in German). Norderstedt, Germany: Verlag Klaus D. Patzwall. ISBN978-3-931533-45-8.
Patzwall, Klaus D. (2008). Der Ehrenpokal für besondere Leistung im Luftkrieg [The Honor Goblet for Outstanding Achievement in the Air War] (in German). Norderstedt, Germany: Verlag Klaus D. Patzwall. ISBN978-3-931533-08-3.
Prien, Jochen; Stemmer, Gerhard; Rodeike, Peter; Bock, Winfried (2005). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 9/I—Winterkampf im Osten—6.12.1941 bis 30.4.1942 [The Fighter Units of the German Air Force 1934 to 1945—Part 9/I—Winter War in the East—6 December 1941 to 30 April 1942] (in German). Eutin, Germany: Struve-Druck. ISBN978-3-923457-76-2.
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 May 1942 bis 3 February 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/III—Einsatz im Osten—4.2. bis 31.12.1943 [The Fighter Units of the German Air Force 1934 to 1945—Part 12/III—Action in the East—4 February to 31 December 1943] (in German). Eutin, Germany: Buchverlag Rogge. ISBN978-3-942943-07-9.
Prien, Jochen; Stemmer, Gerhard; Balke, Ulf; Bock, Winfried (2022). Die Jagdfliegerverbände der Deutschen Luftwaffe 1934 bis 1945—Teil 15/II—Einsatz im Osten—1.1. bis 31.12.1944 [The Fighter Units of the German Air Force 1934 to 1945—Part 15/II—Action in the East—1 January to 31 December 1944] (in German). Eutin, Germany: Buchverlag Rogge. ISBN978-3-942943-28-4.
Scherzer, Veit (2007). Die Ritterkreuzträger 1939–1945 Die Inhaber des Ritterkreuzes des Eisernen Kreuzes 1939 von Heer, Luftwaffe, Kriegsmarine, Waffen-SS, Volkssturm sowie mit Deutschland verbündeter Streitkräfte nach den Unterlagen des Bundesarchives [The Knight's Cross Bearers 1939–1945 The Holders of the Knight's Cross of the Iron Cross 1939 by Army, Air Force, Navy, Waffen-SS, Volkssturm and Allied Forces with Germany According to the Documents of the Federal Archives] (in German). Jena, Germany: Scherzers Militaer-Verlag. ISBN978-3-938845-17-2.