The Second Battle of Copenhagen (or the Bombardment of Copenhagen) (16 August 7 September 1807) was a British bombardment of the Danish capital, Copenhagen, in order to capture or destroy the Dano-Norwegian fleet during the Napoleonic Wars. The incident led to the outbreak of the Anglo-Russian War of 1807, which ended with the Treaty of rebro in 1812. In Denmark it is widely known as the first terror attack on a European capital.Britain's first response to Napoleon's Continental System was to launch a major naval attack on Denmark. Although ostensibly neutral, Denmark was under heavy French pressure to pledge its fleet to Napoleon. In September 1807, the Royal Navy bombarded Copenhagen, seizing the Danish fleet, and assured use of the sea lanes in the North Sea and Baltic Sea for the British merchant fleet. A consequence of the attack was that Denmark did join the Continental System and the war on the side of France, but without a fleet it had little to offer.The attack gave rise to the term to Copenhagenize.

The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is consequently known as the Senior Service.

From the middle decades of the 17th century, and through the 18th century, the Royal Navy vied with the Dutch Navy and later with the French Navy for maritime supremacy. From the mid 18th century, it was the world's most powerful navy until the Second World War. The Royal Navy played a key part in establishing and defending the British Empire, and four Imperial fortress colonies and a string of imperial bases and coaling stations secured the Royal Navy's ability to assert naval superiority globally. Owing to this historical prominence, it is common, even among non-Britons, to refer to it as "the Royal Navy" without qualification. Following World War I, it was significantly reduced in size, although at the onset of World War II it was still the world's largest. During the Cold War, the Royal Navy transformed into a primarily anti-submarine force, hunting for Soviet submarines and mostly active in the GIUK gap. Following the collapse of the Soviet Union, its focus has returned to expeditionary operations around the world and it remains one of the world's foremost blue-water navies.The Royal Navy maintains a fleet of technologically sophisticated ships, submarines, and aircraft, including 2 aircraft carriers, 2 amphibious transport docks, 4 ballistic missile submarines (which maintain the nuclear deterrent), 6 nuclear fleet submarines, 6 guided missile destroyers, 12 frigates, 11 mine-countermeasure vessels and 26 patrol vessels. As of August 2021, there are 75 operational commissioned ships (including submarines as well as one historic ship, HMS Victory) in the Royal Navy, plus 11 ships of the Royal Fleet Auxiliary (RFA); there are also five Merchant Navy ships available to the RFA under a private finance initiative. The RFA replenishes Royal Navy warships at sea, and augments the Royal Navy's amphibious warfare capabilities through its three Bay-class landing ship vessels. It also works as a force multiplier for the Royal Navy, often doing patrols that frigates used to do.

The Royal Navy is part of Her Majesty's Naval Service, which also includes the Royal Marines. The professional head of the Naval Service is the First Sea Lord who is an admiral and member of the Defence Council of the United Kingdom. The Defence Council delegates management of the Naval Service to the Admiralty Board, chaired by the Secretary of State for Defence. The Royal Navy operates from three bases in Britain where commissioned ships and submarines are based: Portsmouth, Clyde and Devonport, the last being the largest operational naval base in Western Europe, as well as two naval air stations, RNAS Yeovilton and RNAS Culdrose where maritime aircraft are based.