Competitive pricing led to commercial success, and Kadetts continued to be produced during the early months of the war: by the time production ended in May 1940, following the intensification of World War II, 106,608 of these Opel Kadetts[8] were produced on the assembly line at Opel's Rüsselsheim plant, which had been the first major car plant in Germany to apply the assembly-line techniques pioneered by Henry Ford.