Lorraine. Joffre also added Drude's 45th Division of Zouaves from Algeria, who made a huge impression marching through Paris, and IV Corps from Third Army. The Prefect of Police had resigned “on grounds of health” on being ordered to remain at his post. Gallieni stayed up with his staff all night drawing up plans for Sixth Army to give battle between the Oise and Pontoise. Joffre had Millerand place Gallieni under his own command on 2 September. Gallieni believed that Joffre's strategy of retreating behind the Seine was “divorced from reality” as the Germans would not allow his forces enough time to rally. He spent the night of 2/3 September at his new HQ at Lycee Victor-Duruy, expecting a German attack the next day. On the morning of 3 September he learned that von Kluck was marching southeast across Paris, offering his flank to a French counterattack. The first public proclamation on the morning of 3 September promised to defend Paris “to the last extremity.” That morning Gallieni set engineers and civilian labourers to work cutting down woods and trees, and preparing bridges and buildings for demolition to clear lines of sight for guns. For three days concrete was poured and barbed wire strung up. Even the Eiffel Tower was prepared for demolition. Paris had 2,924 guns, ranging from 155mm to 75mm. Hospitals and fire departments put on alert. Gas for three months of electricity was stockpiled, along with bread for 43 days, salt for 20 days and meat for 12 days. Pigeons were brought under state control for carrying messages. Lt-Col Dreyfus rejoined the artillery. Civilian paniquards were encouraged to leave and reconnaissance patrols were set up. Planning the Counterattack On the night of 3–4 September Joffre sent a handwritten note to Gallieni, wanting Maunoury's Sixth Army to push east along the north bank of the Marne, although not specifying a date. This was in line with his modification of Instruction General No 4 (2 September), envisaging a giant pocket from Paris to Verdun, of which he enclosed copies to Gallieni. Gallieni decided that it was “vital to act quickly” so as not to leave Paris uncovered. At 09:10 on 4 September, based on the previous day's reports of Paris aviators, which he had passed on to Joffre, and on his own authority, he sent orders to Maunoury to be ready to move his army that afternoon (now reinforced