On 30 August Joffre recommended that the French government evacuate Paris and learned of the Russian disaster at Tannenberg, although he was aware that two German corps were still headed east as reinforcements for East Prussia. On 1 September the Fifth Army retreated across the Aisne in some confusion, and Joffre issued his "Instruction Generale No 4", placing Maunoury's Sixth Army under the command of Joseph Gallieni as military governor of Paris and forming a new cavalry corps under Louis Conneau to fill the gap between the Fifth Army and the British Expeditionary Force (BEF). At this stage his mind was still leaning towards Berthelot's old suggestion that the Fifth Army attack westwards against the inside of the German right wing.