 The Austro-Hungarian base at Zemun was briefly evacuated due to a Serbian counterattack in September. On 28 September, Körös, along with the monitor SMS Temes, a patrol boat and a minesweeper, broke through the minefields on the Sava near Belgrade and pushed upstream to join the fighting near Šabac. In November, French artillery support arrived in Belgrade, endangering the monitor's anchorage. The stalemate continued until December 1914 when the Serbs briefly evacuated Belgrade in the face of an Austro-Hungarian assault, although Körös did not support this action. After less than two weeks, the Austro-Hungarians had to withdraw from Belgrade, and it was soon recaptured by the Serbs with Russian and French assistance. Körös continued in action against Serbia and her allies at Belgrade until December, when the base of the Danube Flotilla was withdrawn north to Petrovaradin for the winter.
