The Courageous class consisted of three battlecruisers known as "large light cruisers" built for the Royal Navy during the First World War. The class was nominally designed to support the Baltic Project, a plan by Admiral of the Fleet Lord Fisher that was intended to land troops on the German Baltic Coast. Ships of this class were fast but very lightly armoured, with only a few heavy guns. They were given a shallow draught, in part to allow them to operate in the shallow waters of the Baltic but also reflecting experience gained earlier in the war. To maximize their speed, the Courageous-class battlecruisers were the first capital ships of the Royal Navy to use geared steam turbines and small-tube boilers.
HMS Thunderer was one of two Devastation-class ironclad turret ships built for the Royal Navy in the 1870s. She suffered two serious accidents before the decade was out and gained a reputation as an unlucky ship for several years afterward. The ship was assigned to the Mediterranean Fleet in 1878 and was reduced to reserve in 1881 before being recommissioned in 1885. Thunderer returned home in 1887 and was again placed in reserve. She rejoined the Mediterranean Fleet in 1891, but was forced to return to the UK by boiler problems the following year. The ship became a coast guard ship in Wales in 1895 and was again placed in reserve in 1900. Thunderer was taken out of service in 1907 and sold for scrap in 1909.
The BL 18-inch Mk I naval gun was a breech-loading naval rifle used by the Royal Navy during World War I. It was the largest and heaviest gun ever used by the British. Only the Second-World-War Japanese 46 cm/45 Type 94 had a larger calibre, 18.1 inches (46 cm), and it fired a lighter shell. The gun was a scaled-up version of the BL 15 inch Mk I naval gun and was developed to equip the "large light cruiser" Furious. Its barrel length of 60 ft (18 m) was just 40 calibres, slightly limiting its muzzle velocity.
Imperator Nikolai I was a Russian dreadnought built during World War I for service in the Black Sea. She was designed to counter multiple prospective Ottoman dreadnoughts which had been placed under order by the Ottoman government, since this raised the possibility that the Russian dreadnoughts being built for the Black Sea Fleet could be outclassed. The ship used the same main armament as the preceding Imperatritsa Mariya class, but was larger and more heavily armored. Imperator Nikolai I was launched in 1916, but construction was suspended on 24 October 1917. The Soviets considered completing her in 1923, but later rejected the idea. She was towed to Sevastopol in 1927 and scrapped.
The Brazilian monitor Rio Grande was the second ship of the Pará-class river monitors built for the Imperial Brazilian Navy during the Paraguayan War in the late 1860s. Rio Grande participated in the Passage of Humaitá on 19 February 1868 and provided fire support for the army for the rest of the war. The ship was assigned to the Upper Uruguay flotilla after the war. Rio Grande was scrapped in 1907.
The Brazilian monitor Alagoas was the third ship of the Pará-class river monitors built for the Imperial Brazilian Navy during the Paraguayan War in the late 1860s. Alagoas participated in the Passage of Humaitá on 19 February 1868 and provided fire support for the army for the rest of the war. The ship was assigned to the Upper Uruguay flotilla after the war. Alagoas was transferred to Rio de Janeiro in the 1890s and participated in the Navy Revolt of 1893–94. The ship was scrapped in 1900.
The Brazilian monitor Piauí was the fourth ship of the Pará-class river monitors built for the Brazilian Navy during the Paraguayan War in the late 1860s. Piauí passed the fortifications at Humaitá in July 1868 and provided fire support for the army for the rest of the war. The ship was assigned to the Mato Grosso Flotilla after the war. Piauí was scrapped in 1893.
The Brazilian monitor Ceará was the fifth ship of the Pará-class river monitors built for the Brazilian Navy during the Paraguayan War in the late 1860s. Ceará arrived in Paraguay in mid-1868 and provided fire support for the army for the rest of the war. The ship was assigned to the Mato Grosso Flotilla after the war. Ceará was scrapped in 1884.
HNLMS Prins Hendrik der Nederlanden was an ironclad ramtorenschip built in Great Britain for the Royal Netherlands Navy in the mid-1860s. She was transferred to the Dutch East Indies in 1876 and participated in the Dutch intervention in Lombok and Karangasem in 1894. The ship was hulked in 1899 and scrapped in 1925.
HNLMS Koning der Nederlanden was an iron-hulled ironclad ramtorenschip built by the Rijkswerf at Amsterdam for the Royal Netherlands Navy in the early 1870s. She was the largest ship to serve in the Dutch Navy during the 19th century. The ship was converted to a barracks ship in the late 1890s and stationed in Surabaya in the Dutch East Indies. Koning der Nederlanden was scuttled in Surabaya on 2 March 1942, during the Battle of Java, to prevent her capture by the Japanese.
HNLMS Guinea was an Buffel-class monitor built for the Royal Netherlands Navy in the early 1870s. Rearmed in 1887 with more modern ordnance, she was sold for scrap in 1897.
The two British Devastation-class battleships of the 1870s, HMS Devastation and HMS Thunderer, were the first class of ocean-going capital ship that did not carry sails, and the first which mounted the entire main armament on top of the hull rather than inside it.
The Adder-class monitors were a group of six ironclad monitors built for the Royal Netherlands Navy in the 1870s.
The Heiligerlee-class monitors were a group of five ironclad monitors built for the Royal Netherlands Navy in the late 1860s.
HNLMS Cerberus, was a Heiligerlee-class monitor built in Amsterdam for the Royal Netherlands Navy in the 1860s. Cerberus was a true monitor: a ship with shallow draught, only a few (heavy) guns and decent armor. These characteristics made her very suitable to operate way inland in the Dutch delta.
The Samarang class was a class of steam screw gunvessels of the Royal Netherlands Navy. The class originally comprised Samarang, Batavia and Makassar, but was later extended.
The Dutch naval gun 28 cm A No. 1, or 28 cm L/22, was the first of a few 28 cm Breechloader Krupp guns used by the Dutch navy. The 'A' stands for Achterlader, the Dutch word for Breechloader.
The Wodan class was a class of 16 flat-iron gunboats of the Royal Netherlands Navy.
HNLMS Matador was a monitor built in the late 1870s.
Netherlands