Tuhia he tomokanga mō tēnei wāhanga - I tīmata te Pakanga o Wīwī, te whakaekenga a Tiamana ki Wīwī me ngā Whenua Iti, i te 10 o Mei 1940. I te 18 o Mei 1940, i uru ia ki te whawhai rererangi me nga rererangi whawhai French Curtiss P-36 Hawk e waru, a ka pupuhihia ki te hauauru o Rethel. Tērā pea ko te "kaitiaki tuarua" a Camille Plubeau tōna toa. I puta a Wilcke i te here, a, ka mau ki a ia hei herehere pakanga. Whai muri i te rangimarie ki Wīwī
, ko ia me Mölders, he herehere pakanga ano hoki, i hoki mai ki te waahanga i te 30 o Pipiri 1940. I whakatairangahia a Wilcke ki te "Hauptmann" i te ra i muri mai ka riro ano i a ia te rangatira o te 7. Ko te "Staffel". I te 11 o Hurae 1940, i whakawhiwhia ki a ia te Iron Cross 1st Class ().