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| Terms of the Washington Naval Treaty | |
|---|---|
| Name | Washington Naval Treaty terms |
| Caption | Delegates at the Washington Naval Conference negotiating the treaty |
| Date signed | 6 February 1922 |
| Location signed | Washington, D.C. |
| Parties | United States, United Kingdom, Japan, France, Italy |
| Effective | 10 October 1923 |
Terms of the Washington Naval Treaty The terms established at the Washington Naval Conference in 1921–1922 set quantitative and qualitative limits on capital ships, cruisers, destroyers, submarines, armament, replacement schedules and conversion rules among the major naval powers, seeking to prevent a naval arms race after World War I, stabilize diplomacy among United States, United Kingdom, Japan, France, and Italy, and influence strategic calculations related to Pacific and European security. Negotiations involved delegations led by figures associated with Warren G. Harding, Lord Fisher, Viscount Cecil, Giovanni Giolitti, and Nobutake Kondō and drew upon precedents from the Treaty of Versailles, Anglo-Japanese Alliance, and interwar naval theories advanced at institutions like Royal Naval College, Greenwich and United States Naval War College.
Delegates to the Washington Naval Conference represented the United States Navy, Royal Navy, Imperial Japanese Navy, French Navy, and Regia Marina and negotiated under presidency and foreign policy figures such as Charles Evans Hughes, Arthur Balfour, Viscount Cecil of Chelwood, Hitoshi Ashida, and Italian ministers connected to Luigi Facta; the conference sought to reconcile post‑World War I fiscal constraints, public opinion influenced by the League of Nations, and strategic interests tied to ports like Pearl Harbor, Gibraltar, Yokosuka, Toulon, and Naples. Delegations referenced prior naval engagements including the Battle of Jutland, doctrinal debates from the Mahanian theory and critiques from voices around Geneva Conference discussions, and reached compromise through shuttle diplomacy mediated in rooms tied to White House and State Department officials.
The treaty codified a capital ship tonnage ratio of 5:5:3:1.75:1.75 among the United States, United Kingdom, Japan, France, and Italy respectively, prescribing maximum total tonnages, individual ship displacement ceilings, and a halt to new capital ship construction beyond agreed totals; this built upon interwar arithmetic debates involving strategists associated with Alfred Thayer Mahan, naval staff planners from Admiralty, Bureau of Navigation (US Navy), and Japanese Imperial staff influenced by Yamamoto Isoroku's contemporaries. The ratio aimed to reflect global responsibilities centered on bases such as Hong Kong, Suez Canal, Panama Canal, Singapore, and Subic Bay while addressing naval industrial capacities around Portsmouth Royal Dockyard, Philadelphia Naval Shipyard, Kure Naval Arsenal, Toulon Arsenal, and La Spezia.
The treaty prohibited construction of capital ships above 35,000 long tons standard displacement and limited main gun calibers to 16 inches, imposing moratoria and scrapping schedules that affected existing fleets including HMS Hood, USS California (BB-44), Nagato-class battleship, Richelieu-class battleship plans, and early Littorio-class battleship designs; naval architects and yards such as Vickers, Newport News Shipbuilding, Kawasaki Shipyards, Ateliers et Chantiers de la Loire, and Cantieri Navali del Tirreno adjusted plans to comply. The terms mandated that agreed numbers of battleships and battlecruisers be retained or disposed of through scrapping or conversion, influencing modernization programs within the Imperial Japanese Navy General Staff, Admiralty Naval Staff, and Chief of Naval Operations offices.
Carriers were limited by displacement and conversion rules permitting certain capital ship hulls to be converted to aircraft carriers within 10,000‑ to 27,000‑ton limits, affecting conversions like USS Langley (CV-1) precedents and later projects exemplified by HMS Hermes and Akagi prior designs and influencing debates in naval bureaus such as Bureau of Aeronautics and Imperial Japanese Navy Air Service. The treaty allowed conversions from existing hulls under specified tonnage credits and restricted new carrier construction tonnage, prompting dockyards including Puget Sound Naval Shipyard, Swan Hunter, Sasebo Naval Arsenal, and Arsenal de Brest to reallocate resources and altered carrier aviation doctrine discussed at institutions like Fleet Air Arm and Naval Airship Program forums.
Cruiser classes were subject to displacement ceilings (10,000 tons for heavy cruisers) and gun limits (8-inch maximum) that shaped designs like County-class cruiser, Furutaka-class cruiser, Pensacola-class cruiser, Jeanne d'Arc (1931) concepts and influenced shipbuilders such as John Brown & Company and Mitsubishi Heavy Industries. Destroyer tonnage and submarine restrictions imposed aggregate limits and range considerations impacting classes like Clemson-class destroyer, Fubuki-class destroyer, S-class submarine, Sirène-class submarine, and Balilla-class submarine while relating to strategic chokepoints near Dardanelles, Malta, Okinawa, and Strait of Gibraltar that navies sought to defend. The limitations aimed to balance fleet scouting, commerce protection, and sea denial missions managed by staffs in Admiralty, Combined Fleet, Bureau of Ships, and Direction Générale de la Marine.
The treaty restricted main battery calibers, ammunition reserves, and replacement cycles, established rules for modernization timing and tonnage accounting for armor and superstructure, and constrained rapid replacement of combat capability that affected vessels such as USS Nevada (BB-36), HMS Queen Elizabeth (1913), Kongō-class battlecruiser, Courbet-class battleship, and Andrea Doria-class battleship plans; ordnance producers and supply chains in firms like Vickers-Armstrongs, Bethlehem Steel, Kawanishi, and Oto Melara had to adapt manufacturing forecasts. Replacement clauses tied allowable refits and reconstructions to age and tonnage limits, influencing naval procurement cycles overseen by ministries including the Ministry of Defence (United Kingdom), Ministry of the Navy (Japan), Department of the Navy (United States), Ministère de la Marine (France), and Ministero della Marina (Italy).
The treaty included a 10‑year duration clause with provisions for review, notice of withdrawal, and technical inspection regimes that involved exchange of plans, on‑site surveys at naval bases like Portsmouth, Yokosuka, Rosyth, Brest, and Taranto, and mechanisms for arbitration linked to actors in League of Nations discussions and diplomatic threads through Washington, D.C. and London missions. Compliance relied on transparency, shipyard documentation, and intergovernmental diplomacy among signatories, while later developments at conferences such as the London Naval Conference (1930) and the Second London Naval Treaty and strategic shifts involving Washington Treaty System successors reflected tensions that culminated in withdrawals and rearmament trajectories prior to Second World War contingencies.