Name↕ | Combatants↕ | Historical conflict↕ | Period of de facto conflict↕ | De jure peace↕ | De facto duration, years↕ | De jure duration, years↕ | De facto – de jure difference, years↕ | Status of claim↕ |
|---|---|---|---|---|---|---|---|---|
First Anglo-Dutch War (Three Hundred and Thirty Five Years' War) | Isles of Scilly vs Dutch Republic | First Anglo-Dutch War (Three Hundred and Thirty Five Years' War) | 1651–1654 | 1,986 | 4 | 335 | 329 | The Dutch Republic under Maarten Tromp declared war solely on the Isles of Scilly, as the final stronghold of the Royalist naval force which was capturing Dutch merchant ships. When the Dutch and the Commonwealth of England signed the Treaty of Westminster (1654), this separate state of war was not mentioned and thus not included in the peace. The Dutch ambassador, visiting in April 1986 to conclude peace, joked that it must have been harrowing to the Scillonians "to know we could have attacked at any moment." |
Peninsular War | Huéscar vs Denmark | Peninsular War | 1809–1814 | 1,981 | 6 | 172 | 167 | The Spanish town of Huéscar declared war on Denmark, as a result of the Napoleonic wars over Spain, where Denmark supported the French Empire. The official declaration of war was forgotten until it was discovered by a local historian in 1981, followed by the signing of a peace treaty on 11 November 1981 by the city mayor and the Ambassador of Denmark. Not a single shot was fired during the 172 years of war, and nobody was killed or injured. |
Russo-Japanese War | Montenegro vs Japan | Russo-Japanese War | 1904–1905 | 2,006 | 2 | 102 | 101 | Montenegro declared war in support of Russia but Montenegro lacked a navy or any other means to engage Japan. After Montenegro (independent in 1904, but united with Serbia by 1918) had voted in 2006 to resume its independence, it concluded a separate peace treaty in order to establish diplomatic relations with Japan. See Japan–Montenegro relations. |
World War I | Costa Rica vs Germany | World War I | 1918 | 1,945 | 1 | 28 | 27 | Due to a dispute over the legitimacy of the government of Federico Tinoco Granados, Costa Rica was not a party to the Treaty of Versailles and did not unilaterally end the state of war. The technical state of war ended after World War II only after they were included in the Potsdam Agreement. Costa Rica did not issue a declaration of war against Germany in World War II. |
Soviet–Japanese War(Part of World War II) | Soviet Union vs Japan | Soviet–Japanese War(Part of World War II) | 1945 | 1,956 | 1 | 11 | 10 | The Soviet–Japanese War was a short conflict that lasted less than a month in 1945. However, despite this, the Soviets refused to sign the Treaty of San Francisco and did not unilaterally end the state of war. Ultimately, the state of war was not formally ended until the Soviet–Japanese Joint Declaration of 1956, 11 years later. |
World War II | Poland vs Japan | World War II | 1941–1945 | 1,957 | 4 | 16 | 12 | In December 1941, the Polish government-in-exile unilaterally declared war on Japan. However, as Soviet-occupied Poland refused to sign the Treaty of San Francisco, the country also did not unilaterally end the state of war. Ultimately, the state of war was not formally ended until 1957, when Japan concluded a separate peace treaty in order to establish diplomatic relations with the Polish People's Republic. See Japan–Poland relations. |
Gulf War | UN Forces (led by United States) vs Iraq | Gulf War | 1991 | 2,003 | 1 | 13 | 12 | The UN resolution which ended the first Gulf War only enacted a ceasefire. It did not end the state of war with Iraq. The British Government would, 12 years later, use the de jure state of war with Iraq to provide the legal basis for the 2003 invasion of Iraq. Opponents of the Iraq War have criticised this interpretation, with one source labelling it as "legal gymnastics" (see Legality of the Iraq War). |
Frequently asked questions
How is the Longest Wars In History list ranked?
The Longest Wars in History list is ranked by community votes. Every visitor can pick one option over another in head-to-head matchups, and the running totals determine the order you see. No editors or algorithms — just real people voting.
How many entries are in this Longest Wars In History dataset?
This dataset contains 7 entries, each with multiple sortable, filterable columns. The full table is visible on this page and can be downloaded as a CSV, JSON, or Excel file.
Can I download the Longest Wars In History data?
Yes. The download buttons at the top of the page give you the full 7-row dataset as CSV, JSON, or Excel. Use of the data is permitted under a Creative Commons Attribution license — credit dtbse.com when you republish.
Related Datasets
More in History
Famous Historical Battles
Decisive military engagements that shaped the course of world history, from ancient clashes to modern conflicts.
Deadliest Wars in History
A comprehensive list of the deadliest wars in human history ranked by estimated death toll, spanning from ancient conflicts to modern warfare.
Famous Battles
Twenty of the most consequential military engagements in world history, from ancient Marathon to the beaches of Normandy.
Famous Postal Systems
Royal Mail, Pony Express, pneumatic tubes — which postal system was the most revolutionary way to deliver a message?
Famous Revenge Stories in History
The Count of Monte Cristo, 47 Ronin, Boudicca's uprising — which revenge saga is most legendary?
Famous Imposters & Identity Fraudsters
Frank Abagnale, Anna Delvey, the Tichborne Claimant — which imposter pulled off the most audacious deception?
Ottoman Sultans
Sultans of the Ottoman Empire from Osman I to Mehmed VI.
Famous Art Forgery Cases Throughout History
Van Meegeren, Beltracchi, Elmyr de Hory — which art forger pulled off the most audacious deception?
Famous Court Jesters and Royal Fools
Triboulet, Will Sommers, Stańczyk, Nasreddin — which court jester used humor to speak truth to power most brilliantly?
Famous Pandemic Responses Throughout History
Venetian quarantine, London plague pits, 1918 flu masks, smallpox vaccination — which pandemic response changed public health forever?
Countries by Formation Date
Sovereign states ordered by date of formation.
Famous Prohibitions in History
US alcohol, Iran alcohol, Bhutan tobacco, Saudi cinema - which ban shaped a society most?