Field Marshal August von Mackensen sporting a Totenkopf insignia on his fur busby in 1929. (Field Marshal August von Mackensen sporting a Totenkopf insignia on his fur busby in 1929. Ullstein Bild/ Getty Images)

Field Marshal August von Mackensen sporting a Totenkopf insignia on his fur busby in 1929. Ullstein Bild/ Getty Images