Another French success was the daring expedition from Alsace into Germany made by Custine, leading the newly created 14,300 strong Armée des Vosges from 19 September onward. He attacked Speyer on 29 September and conquered it the next day. He went on to occupy Worms and Philippsburg without a fight. Custine captured Mainz on 21 October 1792 and penetrated as far as Frankfurt, which surrendered on 31 October.