The Washington Naval Treaty, also known as the Five-Power Treaty, was a treaty signed during 1922 among the major Allies of World War I, which agreed to prevent an arms race by limiting naval construction. It was negotiated at the Washington Naval Conference in Washington, D.C. from November 1921 to February 1922 and signed by the governments of the United Kingdom, United States, France, Italy, and Japan. It limited the construction of battleships, battlecruisers and aircraft carriers by the signatories. The numbers of other categories of warships, including cruisers, destroyers, and submarines, were not limited by the treaty, but those ships were limited to 10,000 tons displacement each.
The heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in calibre, whose design parameters were dictated by the Washington Naval Treaty of 1922 and the London Naval Treaty of 1930. The heavy cruiser is part of a lineage of ship design from 1915 through the early 1950s, although the term "heavy cruiser" only came into formal use in 1930. The heavy cruiser's immediate precursors were the light cruiser designs of the 1900s and 1910s, rather than the armoured cruisers of the years before 1905. When the armoured cruiser was supplanted by the battlecruiser, an intermediate ship type between this and the light cruiser was found to be needed—one larger and more powerful than the light cruisers of a potential enemy but not as large and expensive as the battlecruiser so as to be built in sufficient numbers to protect merchant ships and serve in a number of combat theatres.
The Second London Naval Treaty was an international treaty signed as a result of the Second London Naval Disarmament Conference held in London, the United Kingdom. The conference started on 9 December 1935 and the treaty was signed by the participating nations on 25 March 1936.
The Trento class was a group of two heavy cruisers built for the Italian Regia Marina in the late 1920s, the first such vessels built for the Italian fleet. The two ships in the class—Trento and Trieste, were named after the redeemed cities of Trento and Trieste annexed from the Austro-Hungarian empire after the victory in World War I. The ships were very lightly armored, with only a 70 mm (2.8 in) thick armored belt, though they possessed a high speed and heavy main battery of eight 203 mm (8 in) guns. Nominally built under the restrictions of the Washington Naval Treaty, the two cruisers nevertheless exceeded the displacement limits imposed by the treaty.
The Yamato-class battleships were two battleships of the Imperial Japanese Navy (IJN), Yamato and Musashi, laid down leading up to World War II and completed as designed. A third hull laid down in 1940 was converted to an aircraft carrier, Shinano, during construction.
The Fubuki-class destroyers were a class of twenty-four destroyers of the Imperial Japanese Navy. The Fubuki class has been described as the world's first modern destroyer. The Fubuki class set a new standard not only for Japanese vessels, but for destroyers around the world. They remained formidable opponents to the end of World War II, despite being much older than many of their adversaries.
The two Trafalgar-class battleships of the British Royal Navy were late-nineteenth-century ironclad warships. Both were named after naval battles won by the British during the Napoleonic Wars under the command of Admiral Nelson. The two ships were named HMS Nile and HMS Trafalgar.
Plan Z was the name given to the planned re-equipment and expansion of the Kriegsmarine ordered by Adolf Hitler in early 1939. The fleet was meant to challenge the naval power of the United Kingdom, and was to be completed by 1948. Development of the plan began in 1938, but it reflected the evolution of the strategic thinking of the Oberkommando der Marine over the two decades following World War I. The plan called for a fleet centered on ten battleships and four aircraft carriers which were intended to battle the Royal Navy. This force would be supplemented with numerous long-range cruisers that would attack British shipping. A relatively small force of U-boats was also stipulated.
The Akatsuki-class destroyer was a class of four destroyers of the Imperial Japanese Navy. According to most sources, they are regarded as a sub-class of the Fubuki class, partly because the Imperial Japanese Navy itself kept the improvements made a secret, and did not officially designate these four destroyers as a separate class.
Sir John Alexander Hammerton is described by the Dictionary of National Biography as "the most successful creator of large-scale works of reference that Britain has known".
The German submarine U-156 was a Type IXC U-boat of Nazi Germany's Kriegsmarine built for service during World War II. The keel for this boat was laid on 11 October 1940 at the DeSchiMAG AG Weser yard in Bremen, Germany, as yard number 998. She was commissioned on 4 September 1941 under the command of Kapitänleutnant Werner Hartenstein. The city of Plauen, Hartenstein's home city, adopted the submarine within the then popular sponsorship programme (Patenschaftsprogramm), organising gifts and holidays for the crew.
The Asashio-class destroyers were a class of ten destroyers of the Imperial Japanese Navy in service before and during World War II. The overall layout of the class proved successful in service and created a powerful ship that served as the basis for the design of the following two classes of destroyers.
A treaty battleship was a battleship built in the 1920s or 1930s under the terms of one of a number of international treaties governing warship construction. Many of these ships played an active role in the Second World War, but few survived long after it.
German submarine U-163 was a Type IXC U-boat of Nazi Germany's Kriegsmarine built for service during World War II. The keel for this boat was laid down on 8 May 1940 at the DeSchiMAG, Bremen yard as yard number 702. She was launched on 1 May 1941 and commissioned on 21 October under the command of Korvettenkapitän Kurt-Eduard Engelmann.
German submarine U-868 was a Type IXC/40 U-boat of Nazi Germany's Kriegsmarine in the Second World War. The ship was ordered on 25 August 1941 and laid down on 11 March 1943. She was launched on 18 August 1943, at Bremen, Germany. She had two commanders over her operational lifespan, for the period from 23 December 1943 until 21 July 1944 it was Kapitänleutnant Dietrich Rauch, then Oberleutnant zur See Eduard Turre for the period from 22 July 1944 until 9 May 1945.
German submarine U-870 was a Type IXC/40 U-boat of Nazi Germany's Kriegsmarine built for service during the Second World War. She was ordered on 25 August 1941, and laid down on 29 April 1943 at Bremen, Germany. She was launched on 29 October 1943 and commissioned on 3 February 1944.
German submarine U-1228 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.
German submarine U-956 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 20 February 1942 by Blohm & Voss, Hamburg as yard number 156, launched on 14 November 1942 and commissioned on 6 January 1943 under Oberleutnant zur See Hans-Dieter Mohs.
