From 1938 to 1940, Raoul Van Overstraeten was the military adviser of King Leopold III. He refused the function of chief of staff. Minister
Paul-Henri Spaak characterised him as "by far the most intelligent of all military personnel. The drawback is that he knows it himself." After the
German invasion of Belgium in 1940, he remained in the country, living in Brussels, and was not interned by the occupying forces. On 19 November 1940, Leopold III met
Adolf Hitler in
Berchtesgaden. Van Overstraeten organised the meeting. In 1944, Van Overstraeten, mistrusted by the Allies, was passed over for a leading role in the reconstituted Belgian armed forces. Two years later, he retired, and subsequently wrote four books based on his archives. == Publications ==