Denfert-Rochereau is a station on the Paris Métro in France. An adjacent station with the same name is served by RER B. The station opened on 24 April 1906 with the opening of the extension of line 2 Sud from Passy to Place d'Italie. On 14 October 1907 line 2 Sud became part of line 5. On 12 October 1942 the section of line 5 between Étoile and Place d'Italie, including Denfert-Rochereau, was transferred from line 5 to line 6 in order to separate the underground and elevated sections of the metro (because the latter were more vulnerable to air attack during World War II). The line 4 platforms were opened on 30 October 1909 when the southern section of line 4 was opened between Raspail and Porte d'Orléans.