SMS Mainz

Sunk

Type	Light cruiser
War	First World War
Main guns	12 × 4.1″ guns

Sunk at Heligoland Bight.

SMS Mainz (German light cruiser, 1909-1914) Caption: Photographed by Arthur Renard of Kiel, in a photograph received by U.S. Naval Intelligence on 19 October 1910. The ship entered fleet service on 1 October 1909. Photo: Arthur Renard, Public domain · Wikimedia Commons

Armament and specifications

Armament

12 × 10.5 cm (4.1 in) SK L/45 guns
4 × 5.2 cm (2.0 in) SK L/55 guns
2 × 450 mm (17.7 in) torpedo tubes

Armour

Deck: 20–40 mm (0.79–1.57 in)
Gun shields: 50 mm (2 in)
Conning tower: 100 mm (3.9 in)

Builder	AG Vulcan Stettin
Laid down	September 1907
Launched	23 January 1909
Commissioned	1 October 1909
Displacement	Normal: 4,362 metric tons (4,293 long tons) Full load: 4,889 t (4,812 long tons)
Length	130.5 m (428.1 ft)
Speed	26 knots (48 km/h; 30 mph)
Complement	18 officers 349 enlisted men

As built, from the ship's Wikipedia article. Figures there may cover later refits too.

Career

Launched

23 January 1909

Battle of Heligoland Bight

Sunk

28 August 1914