Sweden maintained its policy of neutrality during World War II. When the war began on 1 September 1939, the fate of Sweden was unclear. But by a combination of its geopolitical location in the Scandinavian Peninsula, realpolitik maneuvering during an unpredictable course of events, and a dedicated military build-up after 1942, Sweden kept its official neutrality status throughout the war. At the outbreak of hostilities, Sweden had held a neutral stance in international relations for more than a century, since the end of the Napoleonic Wars in 1814 and the invasion of Norway.
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.
Naval warfare in World War I was mainly characterised by blockade. The Allied powers, with their larger fleets and surrounding position, largely succeeded in their blockade of Germany and the other Central Powers, whilst the efforts of the Central Powers to break that blockade, or to establish an effective counter blockade with submarines and commerce raiders, were eventually unsuccessful. Major fleet actions were extremely rare and proved less decisive.
Japan participated in World War I from 1914 to 1918 as a member of the Allies/Entente and played an important role against the Imperial German Navy. Politically, the Japanese Empire seized the opportunity to expand its sphere of influence in China, and to gain recognition as a great power in postwar geopolitics.
Naval strategy is the planning and conduct of war at sea, the naval equivalent of military strategy on land.
The neutral powers were countries that remained neutral during World War II. Some of these countries had large colonies abroad or had great economic power. Spain had just been through its civil war, which ended on 1 April 1939 —a war that involved several countries that subsequently participated in World War II.
The Blockade of Germany, or the Blockade of Europe, occurred from 1914 to 1919. The prolonged naval blockade was conducted by the Allies during and after World War I in an effort to restrict the maritime supply of goods to the Central Powers, which included Germany, Austria-Hungary, and the Ottoman Empire. The blockade is considered one of the key elements in the eventual Allied victory in the war. In December 1918, the German Board of Public Health claimed that 763,000 German civilians had already died from starvation and disease caused by the blockade. An academic study done in 1928 put the death toll at 424,000, with similar or lower numbers given by more recent scholars, noting however complications with the degree of attribution of Spanish flu deaths. Around 100,000 people may have died during the post-armistice continuation of the blockade in 1919. However, it has been pointed out that there was an even slightly larger civilian excess mortality during the war in the United Kingdom, a country that was much less affected by food shortages.
During World War I (1914–1918), Brazil initially adopted a neutral position, in accordance with the Hague Convention, as an attempt to maintain markets for its export products, mainly coffee, latex and industrially manufactured items.
The U-boat campaign from 1914 to 1918 was the World War I naval campaign fought by German U-boats against the trade routes of the Allies, largely in the seas around the British Isles and in the Mediterranean, as part of a mutual blockade between the German Empire and the United Kingdom.
The Atlantic U-boat campaign of World War I was the prolonged naval conflict between German submarines and the Allied navies in Atlantic waters—the seas around the British Isles, the North Sea and the coast of France.
Norway–United Kingdom relations are foreign relations between Norway and the United Kingdom. The two nations have enjoyed very close cultural, economic, military and political cooperation since Norwegian independence in 1905. Both countries are central allies in NATO, and also have many bilateral agreements involving trade and military ties. Recently, the two have collaborated extensively to provide intelligence and arms to Ukraine during Russia's invasion of that country in 2022.
The United States entered into World War I on 6 April 1917, more than two and a half years after the war began in Europe.
The action off Lerwick was a naval engagement on 17 October 1917 fought in the North Sea during the First World War. The German light, minelaying cruisers SMS Brummer and Bremse attacked a westbound convoy of twelve colliers and other merchant ships and their escorts, part of the regular Scandinavian convoy. The two escorting destroyers and nine neutral Scandinavian ships were sunk off Shetland, Scotland.
The Blockade of Germany (1939–1945), also known as the Economic War, involved operations carried out during World War II by the British Empire and by France in order to restrict the supplies of minerals, fuel, metals, food and textiles needed by Nazi Germany – and later by Fascist Italy – in order to sustain their war efforts. The economic war consisted mainly of a naval blockade, which formed part of the wider Battle of the Atlantic, but also included the bombing of economically important targets and the preclusive buying of war materials from neutral countries in order to prevent their sale to the Axis powers.
The convoy—a group of merchantmen or troopships traveling together with a naval escort—was revived during World War I (1914–18), after having been discarded at the start of the Age of Steam. Although convoys were used by the Royal Navy in 1914 to escort troopships from the Dominions, and in 1915 by both it and the French Navy to cover their own troop movements for overseas service, they were not systematically employed by any belligerent navy until 1916. The Royal Navy was the major user and developer of the modern convoy system, and regular transoceanic convoying began in June 1917. They made heavy use of aircraft for escorts, especially in coastal waters, an obvious departure from the convoy practices of the Age of Sail.
The kvarstad vessels were a number of Norwegian ships held in arrest in Gothenburg during World War II. The ships had been visiting Swedish ports when the German invasion of Norway took place in April 1940. They were eventually claimed by Nortraship, which represented the Norwegian exile government and the British Government, but also by the Germany-supported Quisling regime in Norway. The fate of the ships was disputed through a number of diplomatic notes and trials between the involved parties. The disputed vessels originally numbered 42 ships, with a total of 170,000 ton dw. Some of the ships returned early to occupied Norway, some after recommendation from the Administrative Council. In January 1941 the British Operation Rubble succeeded in bringing five of the ships to the Orkney Islands.
The economic history of World War I covers the methods used by the First World War (1914–1918), as well as related postwar issues such as war debts and reparations. It also covers the economic mobilization of labour, industry, and agriculture leading to economic failure. It deals with economic warfare such as the blockade of Germany, and with some issues closely related to the economy, such as military issues of transportation. For a broader perspective see home front during World War I.
Sweden, following its long-standing policy of neutrality since the Napoleonic Wars, remained neutral throughout World War I between 28 July 1914 and 11 November 1918. However, this neutrality was not maintained without difficulty and Sweden at various times sympathised with different parties in the conflict.
The diplomatic history of World War I covers the non-military interactions among the major players during World War I. For the domestic histories of participants see home front during World War I. For a longer-term perspective see international relations (1814–1919) and causes of World War I. For the following (post-war) era see international relations (1919–1939). The major "Allies" grouping included Great Britain and its empire, France, Russia, Italy and the United States. Opposing the Allies, the major Central Powers included Germany, Austria-Hungary, the Ottoman Empire (Turkey) and Bulgaria. Other countries also joined the Allies. For a detailed chronology see timeline of World War I.
Germany entered into World War I on August 1, 1914, when it declared war on Russia. In accordance with its war plan, it ignored Russia and moved first against France–declaring war on August 3 and sending its main armies through Belgium to capture Paris from the north. The German invasion of Belgium caused Britain to declare war on Germany on August 4. Most of the main parties were now at war. In October 1914, the Ottoman Empire joined the war on Germany's side, becoming part of the Central Powers. Italy, which was allied with Germany and Austria-Hungary before World War I, was neutral in 1914 before switching to the Allied side in May 1915.
