- December 1936 - graduates from the Riga flight school Sport Aviator program.
- 1937 - enrolls in military college (Rank: Corporal)
- Maintains his flight skills by participating in the Latvian Aero Club's Reserve Squadron.
- 1939 - Graduates from Military College and is assigned directly to the Aviation Regiment. (Rank: Lieutenant)
- March 23, 1937 - assigned to the 8th Naval Reconnaissance unit, stationed in Liepaja.
- 1943 - 1944 (German occupation) - Grube serves as an instructor at the Liepaja-Grobini flight school, preparing Latvian aviators
for the Luftwaffe Legion Lettland.
- After the war, emigrates to the USA.
- Bruvelis, Edvins Latviesu Aviacijas Vesture
- Daugavas Vanagu Menesraksts, 1979 No.1 pg. 35
- Hazners & Berzins (ed) Latviesu Karavirs Otra Pasaules Kara Laika Vol.7 pg.17
- Kadets No.12 (1983)
- Kadets No.17 (1990)
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