Mezue ahịrịokwu na-esonụ: Mgbe Agha Worldwa nke Abụọ malitere na Septemba 1939, Kopp sonyeere French Foreign Legion dị ka onye ọrụ agha ma lụọ agha na France na May-June 1940, na-adịgide ndụ na Blitzkrieg nke ọtụtụ n'ime ndị ibe ya emeghị. Kopp merụrụ ahụ nke ukwuu ma bụrụ onye mkpọrọ mana ọ gbapụrụ n'ụlọ ọgwụ ndị agha wee nwee ike ịlaghachi n'otu ya, ugbu a ọ bụ onye agha.
ndị agha e meriri emeri, na mpụga Marseilles n'August. N'ọnwa na-eso ya, a kpọfere Kopp n'isi ụlọ ọrụ ndị Foreign Legion na Algeria, ebe a chụrụ ya n'ọrụ agha ma nye ya ụgwọ ezumike nka 80%.