Brussels, Opera Royale de la Monnaie playbill, 7 May 1916. Performance by an all German cast during German Occupation of Belgium in World War I. Ernst Kraus, Walter Eckard, Poldi Zuska, Walter Soomer, Zdenka Mottl-Fassbender, Marta Weber-Neubeck. The orchestra was composed by Belgian and German Army Bands. Conductor : Richard Hagel. A rarity!