In March 1944, Hungary was occupied by the Wehrmacht. This invasion was formally known as Operation Margarethe (Unternehmen Margarethe).[1][2]
^Andreas Hillgruber, Helmuth Greinert, Percy Ernst Schramm, Kriegstagebuch des Oberkommandos der Wehrmacht (Wehrmachtführungsstab) 1940-1945, Band IV: 1. Januar 1944 – 22. Mai 1945 (Bernard & Graefe, 1961)
^Carlile Aylmer Macartney, October Fifteenth: A History of Modern Hungary, 1929–1945, 2 vols. (Edinburgh University Press, 1956–57), II, 226.