French cruiser Dupetit-Thouars

Sister ship Montcalm at anchor, 1902
History
France
Namesake:	Aristide Aubert Du Petit Thouars
Builder:	Arsenal de Toulon
Laid down:	1897
Launched:	1901
Fate:	Sunk, 7 August 1918
General characteristics
Class and type:	Gueydon-class armoured cruiser
Displacement:	9,367 tonnes (9,219 long tons)
Length:	137.97 m (452 ft 8 in)
Beam:	19.38 m (63 ft 7 in)
Draught:	7.67 m (25 ft 2 in)
Installed power:	22,000 PS (16,000 kW) 28 Belleville boilers
Propulsion:	3 Shafts, 3 vertical triple-expansion steam engines
Speed:	22 knots (41 km/h; 25 mph)
Range:	8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph)
Complement:	566
Armament:	2 × single 194 mm (7.6 in)/40 guns 8 × single 164 mm (6.5 in)/45 guns 4 × single 100 mm (3.9 in)/45 guns 10 × single 47 mm (1.9 in)/55 guns 4 × single 37 mm (1.5 in) guns 2 × 450 mm (17.7 in) torpedo tubes
Armour:	Waterline belt: 80–150 mm (3.1–5.9 in) Deck: 30–55 mm (1.2–2.2 in) Gun turrets: 160–176 mm (6.3–6.9 in)

Dupetit-Thouars was a Gueydon-class armoured cruiser of the French Navy. She was torpedoed and sunk on 7 August 1918 by SM U-62 with the loss of 13 of her crew.

Designed by the naval architect Emile Bertin, the Gueydon-class ships were intended to fill the commerce-raiding strategy of the Jeune École. They measured 137.97 meters (452 ft 8 in) long overall with a beam of 19.38 meters (63 ft 7 in) and had a draught of 7.67 meters (25 ft 2 in). Dupetit-Thouars displaced 9,367 metric tons (9,219 long tons). The ship had a crew of 566 officers and enlisted men.

The Gueydon class had three vertical triple-expansion steam engines, each driving a single propeller shaft. Steam for Dupetit-Thouars's engines was provided by 28 Belleville boilers and they were rated at a total of 22,000 metric horsepower (16,000 kW) that gave them a speed of 22 knots (41 km/h; 25 mph). The ships enough coal to steam for 8,500 nautical miles (15,700 km; 9,800 mi) at a speed of 10 knots (19 km/h; 12 mph).

The Gueydons had a main armament that consisted of two 40-caliber 194 mm (7.6 in) guns that were mounted in single gun turrets, one each fore and aft of the superstructure. Their secondary armament comprised eight 45-caliber quick-firing (QF) Canon de 164 mm (6.5 in) Modèle 1893 guns in casemates. For anti-torpedo boat defense, they carried four 45-caliber QF Canon de 100 mm (3.9 in) Modèle 1891 guns on the forecastle deck, as well as ten QF 47 mm (1.9 in) and four QF 37 mm (1.5 in) Hotchkiss guns. They were also armed with two submerged 450-millimetre (17.7 in) torpedo tubes.