Renault built his first factory on the island between 1929 and 1934. For the rest of the twentieth century the island's history would be the history of the Renault plant. The factory was self-sufficient, with its own electric power generation facilities and several testing sites including an underground test track. Infrastructure also included dock facilities necessary for taking delivery of bulk supplies and for transporting finished automobiles by river. Billancourt became France's largest factory, employing more than 30,000 people. During the Second World War the factory, which was at this time being used to produce trucks for the Germans, was an easy target for bomber pilots using the River Seine to navigate, and suffered from several destructive allied bombings attacks. Renault himself was accused of collaboration directly after the war, and in the frenzied atmosphere of retribution that characterized the post-liberation period he died in prison under suspicious circumstances, and without benefiting from the trial which had been intended for him. His company was placed under the direction of a well-connected resistance hero, and then, on 15 January 1945 nationalised and renamed "Régie nationale des usines Renault (RNUR)"