After brief service with the Hungarian People's Republic at the end of the war, she was transferred to the newly created Kingdom of Serbs, Croats and Slovenes (later Yugoslavia), and renamed Drava.

During the German-led Axis invasion of Yugoslavia in April 1941, Drava spent six days shelling airfields near Mohács in Hungary and fought off a small flotilla of Hungarian gunboats.

Most of these had little effect, but the last bomb dropped straight down Drava's funnel and exploded in her engine room, killing 54 of the crew, including her captain, Aleksandar Berić.

Berić was posthumously awarded the Order of Karađorđe's Star for his sacrifice, and the base of the Serbian River Flotilla at Novi Sad is named after him.

SMS Enns was constructed for the Austro-Hungarian Navy as the name ship of the Enns-class river monitors by Schiffswerft Linz and Stabilimento Tecnico Triestino (STT).

Enns continued in action against Serbia and her allies at Belgrade until late December, when the monitor base was withdrawn to Petrovaradin for the winter.

The convoy was undetected as it sailed past Belgrade at night during a storm, but after the monitors returned to base, the steamer struck a mine near Vinča, and after coming under heavy artillery fire, exploded near Ritopek.

[13] On 22 April 1915, a British picket boat that had been brought overland by rail from Salonika was used to attack the Danube Flotilla anchorage at Zemun, firing two torpedoes without success.

[15] During the final river crossing and support of the resulting bridgehead, Enns was near Grosser Krieg Island on 8 October when she received a direct hit below the waterline and her 120 mm (4.7 in) magazine flooded.

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.

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.

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.

Under the terms of the Treaty of Saint-Germain-en-Laye concluded in September 1919, Enns was transferred to the KSCS along with a range of other vessels, including three other river monitors.

[24] In 1932, the British naval attaché reported that Yugoslav ships were engaging in little gunnery training, and few exercises or manoeuvres, due to reduced budgets.

[30] On 10 April, Drava and her fellow monitor Morava were ordered to sail downstream to conform with the withdrawals of the 1st and 2nd Army's from Bačka and Baranja.

[28] About 14:00 the following day, a Yugoslav lookout near Batina signalled Drava that a group of four Hungarian patrol boats, armed with 70 mm (2.8 in) guns, was coming down the Danube from the direction of Mohács.

[31] Early on 12 April, with the other three monitors having been scuttled the night before, Drava was attacked by Junkers Ju 87 Stuka dive bombers of Sturzkampfgeschwader 77 flying from Arad, Romania.

[30] Having ordered the burning of codes before she sank, Berić and his first officers were among the dead, but two of the successful anti-aircraft gunners, Rade Milojević and Miroslav Šurdilović, survived.