When she returned to the flotilla after repairs, she saw action at Rjahovo in early October 1916, where she contributed to the defeat of the Romanian Flămânda Offensive. The Romanian attempt to cross the Danube to attack the rear of "Generalfeldmarschall" August von Mackensen's Austro-Hungarian Third Army was thwarted, and a force consisting of "Enns", the monitors , and , the patrol boat "Viza" and the armed steamer "Balaton" destroyed a pontoon bridge near Rjahovo. After forays against Giurgiu to secure trains loaded with coal and oil, in November "Enns" and other ships supported the crossing of the Danube by von Mackensen's army at Sistow. The following month, "Enns" bombarded Căscioarele, driving enemy troops out of the village. From late December 1916 to mid-March 1917, "Enns" and other ships of the flotilla wintered at Turnu Severin.