 On 10 November the Bulgarian First Division was able to cross the South Morava at Leskovac, about 18 miles south of Niš, but a Serbian force consisting of the Timok I, Sumidija II, and Morava II Divisions were able to mount a successful counterattack driving the Bulgarians back toward Leskovac, using this respite, the Serbians continued their retreat toward Priština.On 11 November, the Bulgarian First Army’s after taking Niš established contact with the German X Reserve Corps it then turned to the southwest toward Kosovo in pursuit of the retreating Serbs, for two days, the greatly outnumbered Serbian army held Prokuplje but eventually had to retreat.The most direct pursuit of the Serbians was undertaken by the Germans with an expanded X Reserve Corps with the 107th Infantry Division attached to Prussian General Kosch’s command.