Mezue ahịrịokwu na-esonụ: N'ọnwa Juun afọ 1941 na mbido nke Operation Barbarossa, Kleist duziri 1st Panzer Group dị ka akụkụ nke Army Group South - nke e nyere ọrụ ijide Moldavia na Ukraine - wee hụ ihe ịga nke ọma na mbido mbido mbido nke mbuso agha, na-aga n'ihu na Ukraine. 1st Panzer Group mebiri Stalin Line, wee merie ndị agha ise nke ndị agha Soviet nke ise na ndị agha nke isii na
Agha nke Brody (23 ruo 30 June 1941). Na July 1941 n'oge Agha Uman, 1st Panzer Group mebiri ụzọ ndị Soviet Southern Front, na-eduga na nnọchibido na mbibi nke ndị agha Soviet nke isii na nke iri na abụọ na ndịda ọwụwa anyanwụ nke obodo Uman (nke dị ugbu a Cherkasy Oblast). N'oge Agha Mbụ nke Kiev nke Ọgọstụ-Septemba 1941, 1st Panzer Group tụgharịrị n'ebe ugwu site na etiti Ukraine na njikọta nke 2nd Panzer Group na-aga n'ihu na ndịda site na Smolensk dugara n'ịgbasa na mbibi nke Soviet Southwestern Front dum n'ebe ọwụwa anyanwụ nke Kiev, na-eme ka ihe karịrị 600,000 funahụ Red Army. Otú ọ dị, agha ahụ tara oké ọnụ, ka ọ na-erule mgbe ahụ, ndị agha Germany nwere nanị ọkara tankị ndị ha nwere ọnwa atọ tupu mgbe ahụ.