Mezue ahịrịokwu a: A na-echekarị na Agha Ụwa nke Abụọ malitere na Septemba 1, 1939, mgbe ndị Nazi Germany, nke Adolf Hitler na-achị, wakporo Poland. Mgbe nke ahụ gasịrị, United Kingdom na France kwupụtara agha megide Germany na 3. N'okpuru Molotov-Ribbentrop Pact nke August 1939, Germany na Soviet Union kewara Poland ma kọwaa "mpaghara mmetụta" ha n'ofe
Finland, Romania na mba ndị dị na Baltic. Site na ngwụcha afọ 1939 ruo mbido afọ 1941, na usoro nke mkpọsa na nkwekọrịta, Germany meriri ma ọ bụ chịkwaa ọtụtụ mpaghara Europe, wee guzobe njikọ Axis na Italy na Japan (yana mba ndị ọzọ mgbe e mesịrị). Mgbe mmalite nke mkpọsa na North Africa na East Africa, na ọdịda nke France n'etiti 1940, agha ahụ gara n'ihu n'etiti ndị Europe Axis ike na British Alaeze Ukwu, na agha na Balkans, agha ikuku nke Britain, Blitz nke UK, na Agha nke Atlantic. N'ụbọchị 22 nke ọnwa Juun, afọ 1941, Germany du ndị mba Axis na Europe wee wakpo mba Soviet Union, mepeere Eastern Front, nke bụ nnukwu agha agha n'akụkọ ihe mere eme, ma mee ka ndị mba Axis, nke kachasị bụ ndị Germany "Wehrmacht", nọrọ n'ọgba aghara.