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GUEYDON armoured cruisers (1902 - 1905)


Montcalm 1900


Name No Yard No Builder Laid down Launched Comp Fate
Dupetit-Thouars     Arsenal de Toulon 17.4.1899 5.7.1901 28.8.1905 sunk 7.8.1918
Gueydon     Arsenal de Lorient 2.8.1898 20.9.1899 1.9.1903 TS 1928, accommodation hulk 7.1935
Montcalm     F C de la Méditerranée, La Seyne 27.9.1898 27.3.1900 24.3.1902 barrack ship 10.1926

Technical data

Displacement normal, t

Dupetit-Thouars: 9367

Gueydon: 9548

Montcalm: 9177

Displacement full, t 
Length, m


Breadth, m


Draught, m

7.67 max

No of shafts



Dupetit-Thouars: 3 VTE, 28 Belleville boilers

Gueydon: 3 VTE, 28 Niclausse boilers

Montcalm: 3 VTE, 20 Normand-Sigaudy boilers

Power, h. p.

Dupetit-Thouars: 22000

Gueydon, Montcalm: 19600

Max speed, kts

Dupetit-Thouars: 22

Gueydon, Montcalm: 21

Fuel, t

coal 1575

Endurance, nm(kts)5000(18)
Armour, mmHarvey nickel steel; belt: 150 - 40, turrets: 200, turret bases: 200 - 50, casemates: 120, deck: 55 - 20, CT: 160

2 x 1 - 194/40 M1893-96, 8 x 1 - 165/45 M1893-96, 4 x 1 - 100/45 M1893, 16 x 1 - 47/40 M1885, 4 x 1 - 37/20 M1885, 2 - 450 TT (sub, beam)



<i>Montcalm</i> 1900
Montcalm 1900

Project history

Smaller version of Jeanne d`Arc but with only four boiler rooms instead of six. To the First World War beginning they already became outdated, but actively served on miscellaneous theatres. Tactiacl diameter was about 900m.

Ship protection

Main belt extended from 1.35m below water to main deck and to upper deck in fwd part in 4.4m from the bows, ending by 85-40mm bulkhead 4m from the stern. Its 2.5m high lower strake was 150mm decreasing to 50mm at lower edge, thickness of this strake decreased to 90mm at fore and 80mm at aft ends. Upper strake tapered from 100 to 75mm from lower strake to main deck level and from 60 to 40mm from main to upper decks. Curved lower deck had 55-50mm flat part connecting with lower edge of main belt by slopes. 20mm flat medium deck connected with top of main belt. A space between these decks was divided into many small compartments, filled with coal or stores. Casemates had 30mm rears, 23mm roofs and 50mm ammunition tubes. 100mm guns were protected by shields. Casemate area was closed by 120mm fwd bulkhead between forecastle and upper decks and 100mm aft one between forecastle and lower decks.



Naval service

 Dupetit-Thouars was torpedoed and sunk by German submarine U62 in 400nm of Brest 7.8.1918. Gueydon since 1928 served as training ship, hulked in 1935 and used as accommodation ship, BU during German occupation. Montcalm was stricken in 1926, used as barrack ship (renamed Trémintin 11.10.1934) and broken up during German occupation.