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 Vardar.

[1] Temes (II) was commissioned into the Danube Flotilla in 1915, and was in action against the Serbian Army at Belgrade in early October, when the Serbs evacuated the city in the face of an Austro-Hungarian assault.

During this task, she attempted to draw fire away from the battle-damaged monitor Enns but after receiving a direct hit in the crew quarters aft, she had to move out of range.

She was run ashore to put out fires and stop leaks, before being towed out of the battle area by an armed steamer, and taken to Budapest for repairs.

[8] The geopolitical position of Romania was uncertain, with the Central Powers being aware that the Romanians were negotiating to enter the war on the side of the Entente.

Flottenabteilung Wulff was sent through the mouth of the Danube and across the Black Sea to Odessa, where it spent several months supporting the Austro-Hungarian troops enforcing the peace agreement with Russia.

The Danube Flotilla then protected Austro-Hungarian troops withdrawing towards Budapest, fighting French and irregular Serbian forces as they withdrew, and arrived on 6 November.

[15] 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.

[21] On 11 April, the two monitors were forced to withdraw from Dubovac towards Belgrade,[22] during which they came under repeated attacks by Junkers Ju 87 Stuka dive bombers.

The three captains conferred, and decided to scuttle their vessels due to the high water levels in the rivers and low bridges, which meant there was insufficient clearance for the monitors to navigate freely.

Armed only with personal weapons and some machine guns stripped from the scuttled vessels, they started towards the Bay of Kotor in the southern Adriatic in two groups.