During the September–October Flămânda Offensive, the Austro-Hungarian river monitors "Bodrog", "Körös" and "Szamos", together with the patrol boat "Barsch" and one coal barge were damaged by Romanian shore batteries (3 were killed on "Barsch") and one large barge loaded with explosives was sunk. "Körös" was disabled after taking 12 shots, still being in repairs at the time of the armistice on the Romanian front in December 1917; only in April 1918 she became operational once again. No Romanian warships were involved in the operation, but rumors about their arrival caused the Austro-Hungarian warships to flee the scene and return to their base at Belene.