I don't think the Germans ran anything in Belgium after 1918. German soldiers of the Brussels garrison mutinied against their officers November 9, 1918. Nov. 11 an Armistice was signed and the last of the German troops left Belgium Nov. 23. The day before King Albert 1 made his Joyous Entry into Brussels. The 120,000 workers that had been deported to Germany came home. Those that had remained in the arms industry probably didn't have warm feelings toward the Germans.

https://sites.google.com/a/damascusknowledge.com/www/home