Mezue ahịrịokwu na-esonụ: Fiebig wee nye KG4 iwu n'oge Agha Belgium, Agha France, na Agha Britain. Na 8 Mee 1940, e nyere ya Knight's Cross nke Iron Cross. N'ọnwa Eprel afọ 1941, o duziri KG4 n'oge ndị Germany na-achị Axis na-awakpo Yugoslavia gụnyere
bọmbụ a tụrụ na Belgrade.