Declaration of War By The United Kingdom - Formal Declarations of War By The United Kingdom

Formal Declarations of War By The United Kingdom

The following table refers to declarations of war since the original Act of Union in 1707.

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War or conflict Opponent(s) Initial authorisation Declaration Monarch Prime Minister Conclusion
War of the Quadruple Alliance Spain 17 December 1718 George I None Treaty of The Hague, 17 February 1720.
War of Jenkins' Ear Spain 23 October 1739 George II Robert Walpole Treaty of Aix-la-Chapelle, 18 October 1748.
War of the Austrian Succession France 31 March 1744 Henry Pelham
Seven Years' War France 17 May 1756 Declaration on France Thomas Pelham-Holles Treaty of Paris, 10 February 1763. British victory. Birth of the British Empire.
Spain 4 January 1762 Declaration on Spain George III
American Revolutionary War France 17 March 1778 Declaration on France Lord North Treaty of Versailles, 3 September 1783.
Spain 1779 Declaration on Spain Treaty of Versailles, 3 September 1783.
Fourth Anglo-Dutch War The Netherlands December 1780 Declaration on the Dutch Republic Treaty of Paris, 20 May 1784.
Napoleonic Wars France 18 May 1803 Henry Addington
Crimean War Russia 28 February 1854 Declaration on the Russian Empire Victoria Earl of Aberdeen Treaty of Paris, 30 March 1856
Anglo-Zulu War Zulu tribe 11 January 1879 Ultimatum by Sir Henry Bartle Frere Benjamin Disraeli The war ended the Zulu nation's independence.
First World War Germany 4 August 1914 Declaration on Germany George V H. H. Asquith Armistice with Germany, 11 November 1918. Treaty of Versailles, 28 June 1919.
Austria-Hungary 12 August 1914 Declaration on Austria-Hungary Austria: Treaty of Saint-Germain-en-Laye, 10 September 1919.
Hungary: Treaty of Trianon, 4 June 1920.
Ottoman Empire 5 November 1914 Declaration on the Ottoman Empire Treaty of Sèvres, 10 August 1920.
Bulgaria 15 October 1915 Declaration on Bulgaria Treaty of Neuilly-sur-Seine, 27 November 1919.
Second World War Germany 3 September 1939 Declaration on Germany George VI Neville Chamberlain Treaty on the Final Settlement with Respect to Germany, 12 September 1990. The Potsdam Agreement on 2 August 1945 agreed the subdivision of Germany following the surrender on 8 May 1945. Austria was part of Germany when War was declared, and was formally re-established at the Treaty of Vienna on 15 May 1955.
Italy 11 June 1940 Declaration on Italy Winston Churchill Armistice with Italy, 3 September 1943. The final peace treaty between Italy and the Allies was signed in Paris on 10 February 1947.
Finland 6 December 1941 Declaration on Finland Moscow Armistice, 19 September 1944. The final peace treaty between Finland and the Allies was signed in Paris on 10 February 1947.
Hungary 6 December 1941 Declaration on Hungary The final peace treaty between Hungary and the Allies was signed in Paris on 10 February 1947.
Romania 6 December 1941 Declaration on Romania Armistice with Romania, 12 September 1944. The final peace treaty between Romania and the Allies was signed in Paris on 10 February 1947.
Japan 8 December 1941 Declaration on Japan Treaty of San Francisco, 8 September 1951. This followed the Surrender of Japan on 15 August 1945 and the Occupation of Japan which began on 28 August 1945.
Bulgaria 13 December 1941 Declaration on Bulgaria Armistice with Bulgaria, 28 October 1944. The final peace treaty between Bulgaria and the Allies was signed in Paris on 10 February 1947.
Thailand 25 January 1942 Declaration on Thailand

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