Operation Wallenstein

(Bohemian commander of the early 17th century)

This was the German naval codeword to advise of the start of an Allied invasion of France (1943/44).

The signal was intended not to trigger a naval response to this invasion, but instead to effect a concentration of all available surface vessels in the western approaches to the Baltic Sea and thereby prevent any Allied attack that might prevent or disrupt the vital U-boat training activities in the Baltic.