Operation Ellamy was the codename for the United Kingdom participation in the 2011 military intervention in Libya. The operation was part of an international coalition aimed at enforcing a Libyan no-fly zone in accordance with the United Nations Security Council Resolution 1973 which stipulated that "all necessary measures" shall be taken to protect civilians. The coalition operation was designated by NATO as Operation Unified Protector, by the US as Operation Odyssey Dawn. The Canadian participation as Operation Mobile and the French participation as Opération Harmattan. It was confirmed in December 2011 that the cost of the operations was £212m – less than was estimated, including £67m for replacing spent munitions, is all expected to be met from the Treasury reserve.

HMS Cumberland was a Batch 3 Type 22 frigate of the British Royal Navy. She was launched in 1986 and commissioned on 10 June 1989. The frigate was on station during the First Gulf War and was part of the Devonport Flotilla based at Devonport Dockyard. Cumberland was decommissioned on 23 June 2011.