Arras had already been in German hands. During von Kluck's rush on Paris his troops drove out the weak French forces holding the city,[24] and occupied it up to the middle of September. When, however, the deadlock occurred on the Aisne, they withdrew from the quaint old place without doing it very much harm. It was on the last day of September 1914 that Maud'huy began to extend his army beyond that of de Castelnau. Soon his left was at Lens, and his cavalry was scouring the country still farther north towards the Lys and the Yser. Several Territorial regiments attached to his army had already been sent to occupy Lille and Douai. You can easily understand that those weak forces would be in great danger if the Germans were to sweep round to the west. The Allied generals, however, believed that they were ahead in the race, and that they would be the first to overlap. They were quite mistaken: the Germans were ahead, and were now preparing to overlap by sending cavalry and infantry in motor buses towards the line of Béthune and Cassel. On the afternoon of 1st October Douai had to be abandoned, and that very day the German guns began to thunder on the hills surrounding Arras. Von Buelow attacked Maud'huy in great force on the flats to the east of the city, while the Bavarians attempted to outflank him on the north. Though he received reinforcements he was obliged to retire behind the city and take up a position on the encircling hills. Before doing so he warned all the men of military age to leave the place. Then began a pitiful exodus to the coast. For two days the Germans fiercely bombarded Arras: the beautiful sixteenth-century town hall, with its superb clock tower, was ruined, and the cathedral, as well as many of the historic houses, was badly damaged. Shells were rained on the place; but the French maintained a stubborn front, and refused to give way. The attack continued right through the month. A most determined assault was made between the 20th and the 26th, when the Prussian Guard came into action; but the enemy could not cross the ramparts. On the 31st a large German force was allowed to enter the suburbs, where a trap had been prepared. The result was that a battalion of the Guard surrendered, and a military train with one of the great siege howitzers was captured. Maud'huy held the gate at Arras against all comers, and too great praise cannot be given to him and his brave troops. Had the Germans been able to sweep through the Arras gate the whole subsequent history of the war would have been changed.