Enje “Ennie” Timmer worked at Fokker and joined the Dutch resistance after witnessing the injustice of the Nazi occupation. In September 1944 he became part of the B.S. group led by Dirk de Geus in Amsterdam, known as the Palladijnen. The group supported people in hiding and later carried out armed and intelligence activities, including handling dropped weapons, forging documents, mapping German positions and preparing resistance actions.
After betrayal by Johan Willem “Hans” Marcelis, the group was arrested on 19 December 1944 during raids in Amsterdam, including at Zwanenburgwal 42. Several members were later executed at Limmen in reprisal for an attack near Castricum. Timmer, Jan Coenraad Roos, Maarten Vrolijk, Harry Lim and Hein Woutman were sent to Kamp Amersfoort. Timmer was transported to Neuengamme in February 1945, where he died on 18 February 1945, officially of acute enterocolitis. His remains were cremated and scattered by the SS.
Since the war, Timmer has been commemorated through the Dutch Roll of Honour, a Stolperstein at his last Amsterdam address, and memorials connected to his former school and family.