 Nyorai kupfuurira kweiyi ndima - Panguva iyo Norway yakapindirwa neGermanyMuna 1940, Boyesen akanga ari mudzidzi wezvemitemo uye nhengo yeLabour Party. Aivawo nenhengo yesangano rezvematongerwe enyika rinonzi Mot Dag. Hurumende yeLabour Nygaardsvold yakatiza kuLondon kuitira kudzivisa kukurumidza kukundikana. Germany yakatora Norway kwamakore mashanu, nepo Boyesen akava rutivi rworwendo rwokuramba. Akanga ari nhume yehurumende yeNorway iri muutapwa uye mumiriri weNorway muStockholm, achitaurirana achimiririra vanonzi Kretsen, denderedzwa remukati rerusununguko rwekuramba kwaaive munyori. Mukati me Kretsen, akashanda pamwe neaichimbova Mutongi weDare Repamusorosoro Ferdinand Schjelderup. Pakasvika nguva yechando ya1944, Boyesen akanga asisina kuchengeteka muNorway, uye akatizira kuSweden. Akashanda somunyori weNorway legation muStockholm kusvikira kusunungurwa kweNorway muna 1945. 