The National Union Government was a form of national government that governed the Grand Duchy of Luxembourg between 1945 and 13 February 1947, in the direct aftermath of the Second World War. During the war, Luxembourg was invaded, occupied, and annexed by Nazi Germany. Just one of the Luxembourgish casualties of the conflict was the pre-war political system; most of the established parties and alliances disappeared, and some of the leading politicians had lost their lives.