He joined the resistance and was tasked with carrying a map to London showing the German defenses along the Scheldt estuary.
[3] After Faber had been checked and approved by the Dutch and British secret service, he joined a group of Dutchmen being trained for Operation Jedburgh, which involved secret agents being parachuted behind enemy lines to conduct sabotage and guerrilla actions and organize local resistance groups.
[3] Shortly after, on 17 September 1944, Faber landed near Son as the radio operator of Jedburgh team Daniel II.
Faber and Tazelaar installed themselves with radio equipment on board a yacht hidden in the reed along the edges of the Lytse Wiid and Nannewiid lakes.
Faber and Tazelaar remained in Friesland until the end of the war, joined for some time by stranded British radio operator Alfred C. Springate.