
The Battle of Britain was a military campaign of the Second World War, in which the Royal Air Force (RAF) and Fleet Air Arm (FAA) of the Royal Navy defended the United Kingdom (UK) against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It has been described as the first major military campaign fought entirely by air forces. The British officially recognise the battle's duration as being from 10 July until 31 October 1940, which overlaps the period of large-scale night attacks known as the Blitz, that lasted from 7 September 1940 to 11 May 1941. German historians do not accept this subdivision and regard the battle as a single campaign lasting from July 1940 to June 1941, including the Blitz.

The Blitz was a German bombing campaign against the United Kingdom in 1940 and 1941, during the Second World War. The term was first used by the British press and is the German word for 'lightning'.

Battle of Britain Day is 15 September 1940, the day on which a large-scale aerial battle in the Battle of Britain took place.
British anti-invasion preparations of the Second World War entailed a large-scale division of military and civilian mobilisation in response to the threat of invasion by German armed forces in 1940 and 1941. The British Army needed to recover from the defeat of the British Expeditionary Force in France, and 1.5 million men were enrolled as part-time soldiers in the Home Guard. The rapid construction of field fortifications transformed much of the United Kingdom, especially southern England, into a prepared battlefield. Sea Lion was never taken beyond the preliminary assembly of forces. Today, little remains of Britain's anti-invasion preparations; only reinforced concrete structures such as pillboxes and anti-tank cubes are commonly found.

The Dunkirk evacuation, code-named Operation Dynamo and also known as the Miracle of Dunkirk, was the evacuation of Allied soldiers during World War II from the beaches and harbour of Dunkirk, in the north of France, between 26 May and 4 June 1940. The operation commenced after large numbers of Belgian, British, and French troops were cut off and surrounded by German troops during the six-week Battle of France. In a speech to the House of Commons, British Prime Minister Winston Churchill called this "a colossal military disaster", saying "the whole root and core and brain of the British Army" had been stranded at Dunkirk and seemed about to perish or be captured. In his "we shall fight on the beaches" speech on 4 June, he hailed their rescue as a "miracle of deliverance".

The Battle of Graveney Marsh, on the night of 27 September 1940 in Kent, England, was the last ground engagement involving a foreign force to take place on the mainland of Great Britain. The fighting took place between the crew of a shot-down German Junkers Ju 88A-1 bomber from KG 77 and a detachment of soldiers from the 1st Battalion, London Irish Rifles (1 LIR) in Seasalter. The Ju 88, W.Nr 088 8099, 3Z+EL, and nicknamed Eule ("Owl") by its crew, had only entered service two weeks earlier. It was crewed by Unteroffizier (Uffz) Fritz Ruhlandt (pilot), Feldwebel Gotthard Richter ; Uffz Erwin Richter ; and Flieger (Private) Jakob Reiner (gunner).

The Action off Lofoten was a naval battle fought between the German Kriegsmarine and the British Royal Navy off the southern coast of the Lofoten Islands, Norway during World War II. A German squadron under Vizeadmiral Günther Lütjens consisting of the battleships Scharnhorst and Gneisenau met and engaged a British squadron under Admiral Sir William Whitworth consisting of the battlecruiser HMS Renown and nine destroyers. After a short engagement, Gneisenau suffered moderate damage and the Germans withdrew.

"Never was so much owed by so many to so few" was a wartime speech made by the British prime minister Winston Churchill on 20 August 1940. The name stems from the specific line in the speech, "Never in the field of human conflict was so much owed by so many to so few", referring to the ongoing efforts of the Royal Air Force crews who were at the time fighting the Battle of Britain, the pivotal air battle with the German Luftwaffe, with Britain expecting an invasion. Pilots who fought in the battle have been known as The Few ever since; at times being specially commemorated on 15 September, "Battle of Britain Day".

Operation Ruthless was the name of a deception operation devised by Ian Fleming in the British Admiralty during World War II, in an attempt to gain access to German Naval Enigma codebooks.

Edward Frederick Lindley Wood, 1st Earl of Halifax,, known as The Lord Irwin from 1925 until 1934 and The Viscount Halifax from 1934 until 1944, was a senior British Conservative politician and diplomat of the 1930s. He held several senior ministerial posts during this time, most notably those of Viceroy of India from 1925 to 1931 and of Foreign Secretary between 1938 and 1940. He was one of the architects of the policy of appeasement of Adolf Hitler in 1936–38, working closely with Prime Minister Neville Chamberlain. However, after the German occupation of Czechoslovakia in March 1939 he was one of those who pushed for a new policy of attempting to deter further German aggression by promising to go to war to defend Poland.

In May 1940, during the Second World War, the British war cabinet was split on the question of whether to make terms with Nazi Germany or to continue hostilities. The main protagonists were the prime minister, Winston Churchill, and the foreign secretary, Viscount Halifax. The dispute escalated to crisis point and threatened the continuity of the Churchill government.

"We shall fight on the beaches" is a common title given to a speech delivered by the British Prime Minister Winston Churchill to the House of Commons of the Parliament of the United Kingdom on 4 June 1940. This was the second of three major speeches given around the period of the Battle of France; the others are the "Blood, toil, tears and sweat" speech of 13 May and the "This was their finest hour" speech of 18 June. Events developed dramatically over the five-week period, and although broadly similar in themes, each speech addressed a different military and diplomatic context.