At the beginning of the founding of Citroen, it was the first time that the first World War was, so its products were mainly shells and military equipment. It was not until the end of the war that the company started to engage in automobile manufacturing activities. In 1934, the first front -wheel drive car was produced in France. Citroen is the earliest company produced by France to produce a assembly line. Therefore, it was only 6 years since its establishment, and the annual output exceeded 100,000 vehicles.