During the German occupation of Czechoslovakia, Zbrojovka Brno produced weapons for the Wehrmacht and the Waffen-SS. In 1944, the factory was severely damaged in the bombing of Brno. After liberation and rebuilding, it resumed production. In the second half of the 1940s, it produced engines, weapons and tractors. In November 1945, a prototype of the Zetor Z-25 tractor was produced, the name Zetor, which was maintained to this day, comes from the words "Zet" (the proclaimed first letter of the armory) and "or" (the end of the word tractor).