Although the howitzers had not been particularly successful, a plan to replace the aft howitzer mount with a turret similar to that used on SMS "Bodrog" was not carried out. 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. In March 1917, "Enns" relocated to Brăila in eastern Romania, where it remained until July 1918. Sent to Linz and Budapest for an overhaul in dry dock, "Enns" then returned to eastern Romania and was stationed at Reni where she met a group of monitors and patrol boats that had been operating against Russia in the Black Sea. In October 1918, the Danube Flotilla was under serious threat of being cut off in the lower Danube by French forces after the Bulgarians concluded an armistice with the British and French. After the steamer "Croatia" was fired on by the French as it tried to get past Lom, she cut her tow line, releasing seven lighters, which ran aground on a sandbank. "Croatia" was hit, suffered casualties and grounded on the Romanian side of the river. The French retrieved three of the lighters and towed them into the anchorage at Lom. The following day, "Enns" and two other monitors managed to release three of the remaining lighters while under heavy French fire, and towed them upstream. The flotilla continued to retreat up the Danube, running the gauntlet of French and Serbian forces. With the dissolution of Austria-Hungary in early November, the South Slavs went ashore at Vukovar.