Blockade of Germany (1939–1945) in the context of "Final Solution"

The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allied naval blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counterblockade. The campaign peaked from mid-1940 to the end of 1943.

The Battle of the Atlantic pitted U-boats and other warships of the German Kriegsmarine (navy) and aircraft of the Luftwaffe (air force) against the Royal Navy, Royal Canadian Navy, United States Navy, and Allied merchant shipping. Convoys, coming mainly from North America and predominantly going to the United Kingdom and the Soviet Union, were protected for the most part by the British and Canadian navies and air forces. These forces were aided by ships and aircraft of the United States beginning on 13 September 1941. The Germans were joined by submarines of the Italian Regia Marina (royal navy) after Germany's Axis ally Italy entered the war on 10 June 1940.

The military history of the United Kingdom in World War II covers the Second World War against the Axis powers, starting on 3 September 1939 with the declaration of war by the United Kingdom and France, followed by the UK's Dominions, Crown colonies and protectorates on Nazi Germany in response to the invasion of Poland by Germany. There was little, however, the Anglo-French alliance could do or did do to help Poland. The Phoney War culminated in April 1940 with the German invasion of Denmark and Norway. Winston Churchill became prime minister and head of a coalition government in May 1940. The defeat of other European countries followed – Belgium, the Netherlands, Luxembourg and France – alongside the British Expeditionary Force which led to the Dunkirk evacuation in June 1940.

Britain and its Empire continued the war against Germany. Churchill engaged industry, scientists and engineers to advise and support the government and the military in the prosecution of the war effort. Germany's planned invasion of the UK was averted by the Royal Air Force denying the Luftwaffe air superiority in the Battle of Britain, and by its marked inferiority in naval power. Subsequently, urban areas in Britain suffered heavy bombing during the Blitz in late 1940 and early 1941. The Royal Navy sought to blockade Germany and protect merchant ships in the Battle of the Atlantic. The Army counter-attacked in the Mediterranean and Middle East, including the North-African and East-African campaigns, and in the Balkans.

Swedish iron ore was an important economic and military factor in the European theatre of World War II, as Sweden was the main contributor of iron ore to Nazi Germany. The average percentages by source of Nazi Germany’s iron ore procurement through 1933–43 by source were: Sweden: 43.0 Domestic production (Germany): 28.2 France: 12.9. Within the German military the Navy was most dependent on Swedish steel as an absolute necessity to the German war effort, according to their grand admiral. It has also been argued that the Swedish export helped prolong the war.

Both the Allies and the Axis were keen to gain control of the mining district in northernmost Sweden, surrounding the mining towns of Gällivare and Kiruna. The importance of this issue increased after other sources of iron were cut off from Germany by the Allied naval blockade during the Battle of the Atlantic. Both the planned Anglo-French support of Finland in the Winter War and the following German occupation of Denmark and Norway during Operation Weserübung were to a large extent motivated by the wish to deny their respective enemies iron critical for wartime production of steel.

The Defence of the Reich (German: Reichsverteidigung) was the strategic defensive aerial campaign fought by the Luftwaffe of Nazi Germany over German-occupied Europe and Germany during World War II against the Allied strategic bombing campaign. Its aim was to prevent the destruction of German civilians, military and civil industries by the Western Allies. The day and night air battles over Germany during the war involved thousands of aircraft, units and aerial engagements to counter the Allied bombing campaigns. The campaign was one of the longest in the history of aerial warfare and with the Battle of the Atlantic and the Allied naval blockade of Germany was the longest of the war. The Luftwaffe fighter force defended the airspace of German-occupied Europe against attack, first by the RAF Bomber Command and then against the RAF and United States Army Air Forces (USAAF) in the Combined Bomber Offensive.

In the early years, the Luftwaffe was able to inflict a string of defeats on Allied strategic air forces. In 1939, Bomber Command was forced to operate at night, due to the extent of losses of unescorted bombers flying in daylight. In 1943, the USAAF suffered several reverses in daylight and called off the offensive over Germany in October limiting their attacks to western Europe as they built up their force. During the war the British built up their bomber force, introducing better aircraft with navigational aids and tactics such as the bomber stream that enabled them to mount larger and larger attacks while remaining within an acceptable loss rate. In 1944 the USAAF introduced metal drop tanks for all American fighters including the newly arrived North American P-51D Mustang variant, which allowed fighter aircraft to escort USAAF bombers all the way to and from their targets. With a change of focus on destroying the German day fighter force, by the spring of 1944 the Eighth Air Force had achieved air supremacy over Western Europe, which was essential for the Allies so they could carry out the invasion of France. The strategic campaign against Germany eased as the Allies' Transport Plan focused their resources on isolating northern France in preparation for the invasion.

The Great Famine (Greek: Μεγάλος Λιμός, sometimes called the Grand Famine) was a period of mass starvation during the Axis occupation of Greece (1941–1944), during World War II. The local population suffered greatly during this period, while the Axis powers initiated a policy of large-scale plunder. Requisitions, together with a blockade by the Allies, the ruined state of the country's infrastructure after the German invasion of Greece, and the emergence of a powerful and well-connected black market, resulted in the Great Famine, with the mortality rate reaching a peak during the winter of 1941–42.

The resulting human suffering, and the resulting pressure from the Greek diaspora, eventually forced the Royal Navy to partially lift the blockade. Through the end of 1941, Kızılay (the Turkish Red Crescent), and in the summer of 1942, the International Red Cross, were able to distribute supplies in sufficient quantities with the help of several foreign and Greece-based humanitarian organizations helping with financial aid and support. The situation remained grim until the end of the Nazi occupation, and continued on a small scale until the end of the war.