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To guard the crossings for their Fourth and Ninth Armies, on the west bank of the Vistula the Russians deployed the 75th Reserve Division (Fourth Army) at Radom, as well as the group of General Delsalle, consisting of the Guard Rifle Brigade, 2nd Rifle Brigade and 80th Reserve Division, at Opatów-Klimontów. Both groups were screened by the Cavalry divisions of the Corps Nowikow. On 28 September German Ninth Army began a meticulously planned advance toward the Vistula River. German XI, Guard and Austro-Hungarian I Corps marched in heavy rain toward Delsalle's group. Because German Army wagons were too heavy for the woeful Polish roads, submerged in several feet of mud, they used light Polish carts hired along with their peasant drivers. As they advanced they improved the roads and bridges so they could support heavy artillery and adjusted the rails to the narrower European gauge. (The Vienna-Warsaw line was already European gauge.) Explosives were cached at road and railway bridges so they could be destroyed if necessary. On 3 October at Klimontów the 3rd and 7th Austrian Cavalry Divisions engaged the Russian Guard cavalry Brigade along with infantry from the 80th Reserve Division and drove them back.
In response to the Austro-German threat, the Russian screen was ordered to fall back. Nowikow's cavalry obeyed, but General Delsalle believed that he could hold his position. The next day, his group was destroyed by the much superior enemy. The Central Powers captured 7,000 prisoners, only a few Russians escaped. The Germans lost 571 men—Austro-Hungarian casualties are not known. The Germans reached the Vistula River on 9 October. The few Russian bridgeheads on the west bank were invested. Their left flank, August von Mackensen’s XVII Corps, continued to march north until it was 19 km (12 mi) from Warsaw. Only small Russian pockets remained on the west bank; they were excellent targets for the German artillery. General Nikolai Ruzsky, commander of the Russian Northwest Front, sent troops from Warsaw to attack XVII Corps on the German left flank. Orders found on the body of a Russian officer revealed that 14 Russian divisions were concentrating against Mackensen’s 5 divisions. The Germans were also privy to Russian movements from intercepted wireless messages. Unlike the messages sent in the clear during the first weeks of the war, now they were in the new Russian code, which by the end of September had been broken by a German reserve officer, Professor Deubner. Three Russian armies were concentrating against German Ninth Army, relieving the pressure on the Austro-Hungarians in the south. The Germans were impressed by the plan, which they attributed to the Grand Duke, to encircle Ninth Army by the thrust from the north into their rear. To prevent this XVII Corps must be reinforced. The Germans wanted the Austro-Hungarians to provide troops to be hurried to the threatened flank, but the Austro-Hungarians did not want to mingle their men with the Germans, so instead they agreed to take over the line on the German right flank.
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