Enns-class river monitor

SMS Enns
Class overview
Name	Sava
Builders	Stabilimento Tecnico Triestino, Linz Ganz Danubius, Budapest
Operators	Austro-Hungarian Navy  Danube Guard  Royal Romanian Navy  Royal Yugoslav Navy  Soviet Navy
Preceded by	Temes class
Succeeded by	Sava class
Built	1912–1915
In service	1914–1958
Completed	2
Lost	1
Retired	1
General characteristics
Type	River monitor
Displacement	540 tonnes (530 long tons)
Length	57.9 m (190 ft 0 in)
Beam	10.3 m (33 ft 10 in)
Draught	1.3 m (4 ft 3 in)
Installed power	2 Yarrow boilers 1,500–1,700 ihp (1,100–1,300 kW)
Propulsion	2 Triple-expansion steam engines
Speed	13 knots (24 km/h; 15 mph)
Range	690 nautical miles (Besarabia, World War II)
Complement	95 officers and enlisted men
Armament	1 × twin 120 mm (4.7 in)/L45 guns 3 × single 120 mm (4.7 in)/L10 howitzers 2 × single 66 mm (2.6 in)/L50 BAG guns 6 × machine guns
Armour	Belt and bulkheads: 40 mm (1.6 in) Deck: 25 mm (0.98 in) Conning tower, gun turrets and cupolas: 50 mm (2.0 in)

The Enns-class river monitors were built for the Austro-Hungarian Navy during the mid-1910s. The two ships of the class were assigned to the Danube Flotilla and participated in World War I. The ships survived the war and were transferred to Romania and the newly created Kingdom of Serbs, Croats and Slovenes (later Yugoslavia) as reparations.