حملة البلقان
Gromotka was born on 2 June 1915 in Kronschkow in the Prussian Province of Posen. In November 1940, he was posted to 6./JG 27, and during the Balkans Campaign of March–April 1941 claimed three victories over Greece, including two RAF Bristol Blenheim bombers of No. 211 Squadron on 13 April 1941.