High Quality Content by WIKIPEDIA articles! The German occupation of Luxembourg in World War I was the first of two military occupations of the Grand Duchy of Luxembourg by Germany in the twentieth century. From August 1914 until the end of World War I in November 1918, Luxembourg was under full occupation by the German Empire. The German government justified the occupation by citing the need to support their armies in neighbouring France, although many Luxembourgers, contemporary and present, have interpreted German actions otherwise.