Mezue ahịrịokwu na-esonụ: Agha France, mwakpo ndị Germany wakporo France na Low Countries, malitere na 10 Mee 1940. Na 18 Mee 1940, ọ lụrụ ọgụ ikuku na ụgbọ elu ndị agha Curtiss P-36 Hawk asatọ nke French ma gbaa ọdịda anyanwụ nke Rethel. O nwere ike ịbụ na onye meriri ya bụ "onye nọ n'okpuru lieutenant" Camille Plubeau. Wilcke gbapụrụ ma bụrụ onye a dọọrọ n'agha. Ịgbaso
mgbe ha na France kwụsịrị agha, ya na Mölders, onye bụkwa onye mkpọrọ agha, laghachiri n'otu ahụ na 30 June 1940. E buliri Wilcke n'ọkwa "Hauptmann" n'ụbọchị na-esote ma weghachite iwu nke 7. "Staffel". (Ọkpụkpụ na-adọkpụ) Na 11 Julaị 1940, e nyere ya ihe nrite nke Iron Cross 1st Class ().