Albertus Dirk Kleisen died on 1944-10-28 at the Waalsdorpervlakte. Cause of his death: executed by a German execution platoon and buried on the Waalsdorpervlakte. The Germans used the Waalsdorpervlakte (plain) in the dune area Meijendel in Wassenaar (near the Hague) during WWII as a fusillade. Resistance fighters held in a nearby prison, the so-called Orange hotel, were brought here and killed in this area. How many people exactly were executed during the war years is not known. The official record says that between 250 and 280, including especially many resistance fighters, were shot here. The coordinate of this location is taken from the map, made in 1945. The date of this record did NOT match one of the known areas with a known date (see map). It does match one of the coordinates (chosen randomly in the mass grave area) of the burial locations marked on the map. This information has mostly been supplied by the 'Stichting Oranjehotel' and the relatives or friends of the victims. Also by the society 'Erepeleton Waalsdorp' and the archive of the municipality of Wassenaar and has not been checked for historical correctness.