Cavalry was seen as leftover from the past in the dawn of modern warfare during World War 1. But Bulgarian General Ivan Kolev was one of the few who still saw a place for them on the modern battlefield. He reinvented the cavalry role and used them together with early motorised infantry - with great success during the Romanian campaign. He died before the war was over but people like August von Mackensen or Heinz Guderian were still impressed with his legacy.
