during World War II, nearly half of German artillery came from its conquered neighbors, its supply system relied in part on 7,000 horses,

According to this article published by the German Federal Archives, 2.8 million horses served in the German armed forces in WW2. The article also notes how successfully the German wartime propaganda portrayed the Wehrmacht as a high-tech motorized army, an image widely held in the public to this day, while in reality horses were its main means of transport.