The M29 class comprised five monitors of the Royal Navy, all built and launched during 1915.
HMS Raglan was a First World War Royal Navy Abercrombie-class monitor, which was sunk during the Battle of Imbros in January 1918.
The Erebus class of warships was a class of 20th century Royal Navy monitors armed with a main battery of two 15-inch /42 Mk 1 guns in a single turret. It consisted of two vessels, Erebus and Terror, named after the two ships lost in the Franklin Expedition. Both were launched in 1916 and saw active service in World War I off the Belgian coast. After being placed in reserve between the wars, they served in World War II, with Terror being lost in 1941 and Erebus surviving to be scrapped in 1946.
The Humber-class monitors were three large gunboats under construction for the Brazilian Navy in Britain in 1913. Designed for service on the Amazon River, the ships were of shallow draft and heavy armament and were ideally suited to inshore, riverine and coastal work but unsuitable for service at sea, where their weight and light draft reduced their speed from a projected twelve knots to under four. The class comprised Humber, Mersey and Severn. All three were taken over by the Royal Navy shortly before the outbreak of the First World War and were commissioned as small monitors. All three saw extensive service during the war and were sold in 1919.
HMS M29 was a Royal Navy M29-class monitor of the First World War. The ship was constructed by Harland & Wolff, in Belfast and launched on 22 May 1915, she was completed in June 1915. During World War I, the monitor served in the Mediterranean Sea at the Battle of Jaffa in 1917 and took part in operations in support of British and White Russian forces in the White Sea during the Russian Civil War in 1919. The ship was then converted to a minelayer and renamed HMS Medusa in 1925. In 1941 Medusa was converted to a repair and depot ship and was renamed HMS Talbot, then renamed HMS Medway II in 1944. In 1946, the vessel was sold for scrap.
HMS M31 was an M29-class monitor of the Royal Navy.
HMS M32 was an M29-class monitor of the Royal Navy.
HMS M28 was a First World War Royal Navy M15-class monitor. She was sunk during the Battle of Imbros in 1918.
HMS M27 was a First World War Royal Navy M15-class monitor. She was also served in the British intervention in Russia in 1919, and was scuttled in the Dvina River on 16 September 1919.
HMS M25 was a First World War Royal Navy M15-class monitor. She was also served in the British intervention in Russia in 1919, and was scuttled in the Dvina River on 16 September 1919.
HMS M26 was a First World War Royal Navy M15-class monitor.
HMS M21 was a First World War Royal Navy M15-class monitor. After service in the Mediterranean and the Dover Patrol, she struck a mine off Ostend in January 1918 and sank off Dover.
HMS M20 was a First World War Royal Navy M15-class monitor.
HMS M19 was a First World War Royal Navy M15-class monitor.
HMS M22 was a First World War Royal Navy M15-class monitor. Later converted to a minelayer and renamed HMS Medea, she was wrecked whilst being towed for breaking up on 2 January 1939.
HMS M23 was a First World War Royal Navy M15-class monitor. After service in the Mediterranean and the Dover Patrol, she was also served in the British intervention in Russia in 1919. Converted to the RNVR drillship Claverhouse in 1922, she served in that capacity at "Leith" until 1958.
HMS M24 was a First World War Royal Navy M15-class monitor. After service in the Dover Patrol, she was also served in the British intervention in Russia in 1919. She was sold in mercantile service in 1920.
HMS M18 was a M15-class monitor built for the Royal Navy during the First World War.
HMS M17 was a First World War Royal Navy M15-class monitor.
HMS M16 was a First World War Royal Navy M15-class monitor.
United Kingdom
