Declaration of War By The United Kingdom - Military Engagements of The United Kingdom (not Formally Declared)

Military Engagements of The United Kingdom (not Formally Declared)

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War or conflict Opponent(s) Initial authorisation Declaration Monarch Prime Minister Conclusion
Malayan Emergency Malayan Communist Party
*Malayan Races Liberation Army		 16 June 1948 Undeclared guerrilla war against Malaysian Communist Forces George VI & Elizabeth II Sir Winston Churchill
(1948-1955)

Sir Anthony Eden
(1955-1957)

Harold Macmillan
(1957-1960)
  • Malayan independence 31 August 1957 under non-communist government;
  • 31 July 1960 independent Malayan Government declares state of emergency over;
  • Communist leader Chin Peng exiled from Malaya
Korean War Democratic People's Republic of Korea
People's Republic of China		 25 June 1950 No declaration of war; authorised by UNSC Resolution 84 Sir Winston Churchill
  • Ongoing (no formal peace treaty signed);
  • Armistice signed 27 July 1953;
  • Division of Korea
Mau Mau Uprising 'Mau Mau' 20 October 1952 State of Emergency declared by British Governor in colonial Kenya Elizabeth II Sir Winston Churchill
(1952-1955)

Sir Anthony Eden
(1955-1956)
  • Rebel leader Dedan Kimathi captured on 21 October 1956;
  • Kenyan independence on 12 December 1963
Iranian coup d'etat Imperial State of Iran (elected Government) 15 August 1953 No declaration of war; coup d'etat orchestrated by the intelligence agencies of the United Kingdom and the United States Sir Winston Churchill
  • Overthrow of elected Government;
  • Restoration of absolute monarchy in Iran until 1979 revolution
Suez Crisis Egypt 31 October 1956 No declaration of war on Egypt Sir Anthony Eden
  • Egyptian political victory;
  • Coalition military victory, with subsequent forced Anglo-French withdrawal;
  • Israeli occupation of Sinai (until 1957);
  • United Nations cease-fire;
  • UNEF deployment in Sinai;
  • Straits of Tiran re-opened to Israeli shipping;
  • Collapse of the British Eden government;
Aden Emergency National Liberation Front (NLF)

Front for the Liberation of Occupied South Yemen (FLOSY)		 10 December 1963 State of Emergency declared in British Crown Colony of Aden and Aden Protectorate Sir Alec Douglas-Home
(1963-1964)

Harold Wilson
(1963-1967)
  • 30 November 1967 British forces withdraw from Aden;
  • No agreement on succeeding government;
  • NLF seize power and establish People's Republic of South Yemen
Falklands War Argentina 2 April 1982 No declaration of war on Argentina Margaret Thatcher
  • No peace treaty signed;
  • Status quo ante bellum
Gulf War Iraq under Saddam Hussein 17 January 1991 No declaration of war on Iraq; authorised by UNSC Resolution 678 John Major
  • Ceasefire 28 February 1991;
  • Iraq forced to withdraw from Kuwait and accept UN resolutions
Bosnian War
(NATO intervention in Bosnia)		 Republika Srpska 16 July 1992 No declaration of war on Republika Srpska; authorised by UNSC Resolution 816
  • Dayton Accords
Bombing of Iraq (December 1998) Iraq under Saddam Hussein 16 December 1998 No declaration of war on Iraq Tony Blair
  • Ceasefire
Kosovo War
(NATO bombing of Yugoslavia)		 FR Yugoslavia 24 March 1999 No declaration of war on Yugoslavia
  • Kumanovo Treaty
British intervention in Sierra Leone (Operation Palliser) Revolutionary United Front 7 May 2000 No declaration of war on Revolutionary United Front;
Intervention in Sierra Leone Civil War
  • Shift in balance of power in favour of Government of Sierra Leone
  • Rebel forces repelled from area around the capital, Freetown
War in Afghanistan Taliban 7 October 2001 No declaration of war on Afghanistan Tony Blair
(2001-2007)

Gordon Brown
(2007-2010)

David Cameron
(2010-ongoing)
  • Removal of Taliban government;
  • Ongoing
Iraq War Iraq under Saddam Hussein 20 March 2003 No declaration of war on Iraq Tony Blair
(2003-2007)

Gordon Brown
(2007-2009)
  • No peace treaty signed;
  • Saddam Hussein overthrown;
  • Coalition Provisional Authority governs Iraq (21 April 2003 - 28 June 2004)
  • 30 April 2009 - British withdrawal from Iraq
2011 Libyan civil war Libya under Muammar Gaddafi 17 March 2011 No declaration of war on Libya; authorised by UNSC Resolution 1973 David Cameron
  • Muammar Gaddafi overthrown;
  • National Transitional Council takes control of Libya;
  • International forces withdraw on October 31, 2011

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