SOE operations in Yugoslavia supported Tito’s Communist Partisans at the expense of the royalist Chetniks. On 5 February 1943 a team of four SOE operatives (Operation Disclaimer) were handed to the Germans by local people shortly after they landed and the next team which arrived several days later were denounced and it was difficult to discover who could be trusted or their political loyalties.
Selby had served with 11 Commando before joining SOE and arrived in Yugoslavia with another SOE agent, twenty-six-year-old John Rochester who was of Yugoslav extraction whose family name was Yovanovic.
Dressed as peasants they attempted to contact the partisans but were captured by pro-German forces and handed to the German authorities. There is much contradictory evidence surrounding the fate of Selby and Rochester. It cannot be confirmed Selby was shot whilst attempting to escape and there is no reliable information concerning the fate of Rochester and both were originally listed missing presumed dead.