and then both sides began to dig in haphazardly, where the opposing lines had stopped moving, which was not always on easily defended ground. At Maricourt, about to the south, the German advance had been stopped short of the village. North of the road, the 26th Reserve Division fought to capture the high ground of Bazentin Ridge, which overlooked the Ancre valley but instead of rolling up the French northern flank, was endangered by a reciprocal French attack. (The French attack reached Sapignies behind the right flank, until counter-attacked by the Guards Corps, which arrived at Bapaume on 2 October.) Joffre added X Corps, north of Amiens, the II Cavalry Corps, south-east of Arras and a provisional corps under General Victor d'Urbal, which had the 77th Reserve Division south-east of Arras and the 70th Reserve Division in Lens, to the which was renamed the Tenth Army, to make another outflanking move near Arras. Aftermath Analysis The French had been able to use the undamaged railways behind their front to move troops more quickly than the Germans, who had to take long detours, wait for repairs to damaged tracks and replace rolling stock. The French IV Corps moved from Lorraine on 2 September in and assembled by 6 September. The French had been able to move troops in up to per day and use hundreds of motor-vehicles, which were co-ordinated by two staff officers, Commandant Gérard and Captain Doumenc. The French could also use Belgian and captured German rail wagons and the domestic telephone and telegraph systems. The initiative held by the Germans in August was not recovered and the troop movements to the right flank were piecemeal. Until the end of the Siege of Maubeuge only the single line from Trier to Liège, Brussels, Valenciennes and Cambrai was available and had to be used to supply the German armies on the right as the 6th Army travelled in the opposite direction, limiting the army to forty trains a day, taking four days to move a corps. Information on German troop movements from wireless interception enabled the French to forestall German moves but the Germans had to rely on reports from spies, which were frequently wrong. The French resorted to more cautious infantry tactics, using cover to reduce casualties and a centralised system of control as the German army commanders followed contradictory plans. The French did not need quickly to obtain