Because Vichy France was occupied by German troops in November 1942 , Vanderpoorten's freedom was strongly restricted. He was apprehended in January 1943, on suspicion of assistance to an escape line for refugees to the United Kingdom.
Vichy France being under German occupation in November 1942 led to restrictions on Vanderpoorten's liberty. He was detained in January 1943 for allegedly aiding an escape route for refugees bound for the UK.