In a letter to de:Gustave Schiefler, from Flanders, at Christmas 1915; as quoted by de:Wolf-Dieter Dube, in Expressionism, de:Wolf-Dieter Dube; Praeger Publishers, New York, 1973, p. 62 <br class="br">Heckel wrote Schiefler about his 'Madonna'-painting, he painted in Ostende, Flander in 1915. Heckel was a medical orderly in Flanders together with Max Beckmann, in World War 1. Both artists got a lot of free time in the army for their artistic activities. The 'Madonna' got destroyed in World War 2. https://www.bildindex.de/document/obj00001491