 Several of the soldiers and airmen that he assisted in this way are documented in the Belgian "Centre for Historical Research and Documentation on War and Contemporary Society" archives (CEGES/SOMA), including Bernard "Bobby" Conville, Clifford L. Hallet, Roger Jules Jacques Verhulst and Allan Gillespie Cowan.However, along with others at the university, he came under suspicion and the Nazi secret police tried to force him to give himself up by imprisoning his wife, Jeanne Brasseur Derscheid (twice) and his parents as hostages at Saint Gilles prison.On October 8, 1941, he taught his last class; on the night of the 17th the GFP secret police arrested him in Brussels.