Opel Blitz in action (1939-1945), engineered and produced in Germany

Serving as the backbone of Wehrmacht’s and Waffen SS’ motorized corps, the Opel Blitz truck was involved in the transport of pretty much anything during WWII ― from soldiers to ammunition, from towing artillery pieces to delivering supplies.
Since the 1930s, Opel had been the largest manufacturer of trucks in Germany, but in 1934, one year after Hitler took office, their production numbers rose rapidly due to the German re-armament plan. New facilities were built in Brandenburg, leading to the production of the Blitz 3.6 three-ton version, which soon became the trademark of the Wehrmacht.

It was the truck that put the Blitz into Blitzkrieg, as its mass production led to wide use during the swift invasions of Poland, and subsequently other European countries.