Mezue ahịrịokwu na-esonụ: Site na 5/6 Jenụwarị 1941 I./StG 1 mere site na St Malo ruo Graz na Austria. Ka ọ na-erule Jenụwarị 23, "groupe" Hitschhold kwagara n'ọdụ ụgbọ elu dị na Otopeni, n'ebe ugwu Bucharest na Romania. Hitschold kwagara Kraynitsi, ndịda-ndịda-ọdịda anyanwụ nke Sofia na Bulgaria. N'ụbọchị 6 nke ọnwa Eprel, ndị otu ahụ chịkọtara Ju 87 39 maka ọrụ. N'ụbọchị a ọ kwadoro "Fliegerkorps" nke asatọ na mbuso agha nke Yugoslavia na Agha Gris. Ọ gbara ogbunigwe na Petric ma rụọ ọrụ na Agha nke Metaxas Line. O nwere ike ịbụ na Hitschhold so mee
Operation Retribution, bọmbụ na mbibi nke etiti Belgrade.