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The Koningshooikt–Wavre Line, abbreviated to KW Line and often known as the Dyle Line after the Dijle (Dyle) river, was a 60 kilometres (37 mi)-long fortified line of defence prepared by the Belgian Army between Koningshooikt and Wavre which was intended to protect Brussels from a possible German invasion. Construction on the KW Line began in September 1939 after World War II had begun but while Belgium itself remained a neutral state. It was subsequently extended southwards from Wavre towards Namur. The line itself consisted of bunkers, anti-tank ditches, and barricades including so-called Cointet-elements and played a key role in Allied strategy during the German invasion of Belgium in May 1940. However, its role in the actual fighting was ultimately minimal. In 2009 an inventory of surviving emplacements was begun.

Adolf Busemann was a German aerospace engineer and influential Nazi-era pioneer in aerodynamics, specialising in supersonic airflows. He introduced the concept of swept wings and, after emigrating in 1947 to the United States under Operation Paperclip, invented the shockwave-free supersonic Busemann biplane.