Dunkirk evacuation in the context of "United Kingdom in World War II"

The Battle of France (French: bataille de France; 10 May – 25 June 1940), also known as the Western Campaign (German: Westfeldzug), the French Campaign (Frankreichfeldzug, campagne de France) and the Fall of France, during the Second World War was the German invasion of the Low Countries (Belgium, Luxembourg and the Netherlands) and France. The plan for the invasion of the Low Countries and France was called Fall Gelb (Case Yellow or the Manstein plan). Fall Rot (Case Red) was planned to finish off the French and British after the evacuation at Dunkirk. The Low Countries and France were defeated and occupied by Axis troops down to the Demarcation line.

On 3 September 1939, France and Britain declared war on Nazi Germany, over the German invasion of Poland on 1 September. In early September 1939, the French army began the limited Saar Offensive but by mid-October had withdrawn to the start line. On 10 May 1940, Wehrmacht armies invaded Belgium, Luxembourg, the Netherlands and parts of France.

Fall Rot (Case Red) was the plan for a German military operation after the success of Fall Gelb (Case Yellow), the Battle of France, an invasion of the Benelux countries and northern France. The Allied armies had been defeated and pushed back in the north to the Channel coast, which culminated in the Dunkirk evacuation. The operation to complete the conquest of France by the German Army began on 5 June 1940. Fall Rot began with a preliminary attack over the river Somme on the Channel Coast to the Seine, beginning on 5 June and the main offensive by Army Group A on 9 June further east over the river Aisne.

HMS Greyhound was a G-class destroyer built for the Royal Navy in the 1930s. Greyhound participated in the Norwegian Campaign in April 1940, the Dunkirk evacuation in May and the Battle of Dakar in September before being transferred to the Mediterranean Fleet in November. The ship generally escorted the larger ships of the Mediterranean Fleet as they protected convoys against attacks from the Italian Fleet. She sank two Italian submarines while escorting convoys herself in early 1941. Greyhound was sunk by German Junkers Ju 87 Stuka dive bombers north-west of Crete on 22 May 1941 as she escorted the battleships of the Mediterranean Fleet attempting to intercept the German sea-borne invasion forces destined for Crete.

Field Marshal John Standish Surtees Prendergast Vereker, 6th Viscount Gort (10 July 1886 – 31 March 1946), was a senior British Army officer. As a young officer during the First World War, he was decorated with the Victoria Cross for his actions during the Battle of the Canal du Nord. During the 1930s he served as Chief of the Imperial General Staff (the professional head of the British Army). He is best known for commanding the British Expeditionary Force that was sent to France in the first year of the Second World War, only to be evacuated from Dunkirk the following year. Gort later served as Governor of Gibraltar and Malta, and High Commissioner for Palestine and Transjordan.

Admiral Sir Bertram Home Ramsay, KCB, KBE, MVO (20 January 1883 – 2 January 1945) was a Royal Navy officer. He commanded the destroyer HMS Broke during the First World War. In the Second World War, he was responsible for the Dunkirk evacuation in 1940 and planning and commanding the naval forces in the invasion of France in 1944.