 He was captured by the Swedish Home Guard close to the Norwegian border, but was sent by plane to the UK by Swedish authorities in December.After arriving in the UK, Gjems-Onstad joined the Norwegian Independent Company 1 ("Kompani Linge") and took British military education.The British decided in 1943 to deploy him to Trøndelag in Norway together with Odd Sørli, Johnny Pevik and Nils Uhlin Hansen.