Imperial German Navy in the context of "Bendlerblock"

The German Empire (German: Deutsches Reich), also referred to as Imperial Germany, the Second Reich, or simply Germany, was the period of the German Reich from the unification of Germany in 1871 until the November Revolution in 1918, when Germany changed its form of government to a republic. The German Empire consisted of 25 states, each with its own nobility: four constituent kingdoms, six grand duchies, five duchies (six before 1876), seven principalities, three free Hanseatic cities, and one imperial territory. While Prussia was only one of the four kingdoms in the realm, it contained about two-thirds of the Empire's population and territory, and Prussian dominance was also constitutionally established, since the King of Prussia was also the German Emperor (Deutscher Kaiser).

The empire was founded on 18 January 1871, when the south German states, except for Austria, Switzerland and Liechtenstein, joined the North German Confederation. The new constitution came into force on 16 April, changing the name of the federal state to the German Empire and introducing the title of German Emperor for Wilhelm I, King of Prussia from the House of Hohenzollern. Berlin remained its capital, and Otto von Bismarck, Minister President of Prussia, became chancellor, the head of government. After 1850, the states of Germany had rapidly become industrialized. In 1871, Germany had a population of 41 million people; by 1913, this had increased to 68 million. A heavily rural collection of states in 1815, the now united Germany became predominantly urban. German factories were often larger and more modern than many of their British and French counterparts, but the preindustrial sector was more backward. The success of the German Empire in the natural sciences was such that one-third of all Nobel Prizes went to German inventors and researchers. During its 47 years of existence, the German Empire became an industrial, technological, and scientific power in Europe, and by 1913, Germany was the largest economy in continental Europe and the third largest in the world. Germany also became a great power, building the longest railway network of Europe, the world's strongest army, and a fast-growing industrial base. Starting very small in 1871, in a decade, the navy became second only to Britain's Royal Navy.

The Luftwaffe (German pronunciation: [ˈlʊftvafə] ) was the aerial-warfare branch of the Wehrmacht before and during World War II. Germany's military air arms during World War I, the Luftstreitkräfte of the Imperial Army and the Marine-Fliegerabteilung of the Imperial Navy, had been disbanded in May 1920 in accordance with the terms of the 1919 Treaty of Versailles, which banned Germany from having any air force.

During the interwar period, German pilots were trained secretly in violation of the treaty at Lipetsk Air Base in the Soviet Union. With the rise of the Nazi Party and the repudiation of the Versailles Treaty, the Luftwaffe's existence was publicly acknowledged and officially established on 26 February 1935, just over two weeks before open defiance of the Versailles Treaty through German rearmament and conscription would be announced on 16 March. The Condor Legion, a Luftwaffe detachment sent to aid Nationalist forces in the Spanish Civil War, provided the force with a valuable testing ground for new tactics and aircraft. Partially as a result of this combat experience, the Luftwaffe had become one of the most sophisticated, technologically advanced, and battle-experienced air forces in the world when World War II began on 1 September 1939. By the summer of 1939, the Luftwaffe had twenty-eight Geschwader (wings). The Luftwaffe also operated a paratrooper force known as the Fallschirmjäger.

The Kriegsmarine (German pronunciation: [ˈkʁiːksmaˌʁiːnə], lit. 'War Navy') was the navy of Nazi Germany from 1935 to 1945. It superseded the Imperial German Navy of the German Empire (1871–1918) and the inter-war Reichsmarine (1919–1935) of the Weimar Republic. The Kriegsmarine was one of three official branches, along with the Heer and the Luftwaffe, of the Wehrmacht, the German armed forces from 1935 to 1945.

In violation of the Treaty of Versailles, the Kriegsmarine grew rapidly during the German naval rearmament in the 1930s. The 1919 treaty had limited the size of the German navy and prohibited the building of submarines.

During World War I, conflict on the Asian continent and the islands of the Pacific included naval battles, the Allied conquest of German colonial possessions in the Pacific Ocean and China, the anti-Russian Central Asian revolt of 1916 in Russian Turkestan and the Ottoman-supported Kelantan rebellion in British Malaya. The most significant military action was the careful and well-executed Siege of Qingdao in China, but smaller actions were also fought at Bita Paka and Toma in German New Guinea.

All other German and Austro-Hungarian possessions in Asia and the Pacific fell without bloodshed. Naval warfare was common; all of the colonial powers had naval squadrons stationed in the Indian or Pacific oceans. These fleets operated by supporting the invasions of German-held territories and by destroying the East Asia Squadron of the Imperial German Navy.

The Kiautschou Bay Leased Territory (German: Deutsches Pachtgebiet Kiautschou), also known as the Jiaozhou, Kiaochau, Kiaochow, Kiauchau, and Kiao-chau Bay Concession, was a German leased territory in Imperial and Early Republican China from 1898 to 1914. Covering an area of 552 km (213 sq mi), it centered on Jiaozhou Bay (Kiautschou-Bucht) on the southeastern coast of the Shandong Peninsula. The administrative center was at Qingdao (Tsingtau). It was operated by the East Asia Squadron of the Imperial German Navy. The Russian Empire resented the German move as an infringement on Russian ambitions in the region.

Karl Dönitz (German: [ˈdøːnɪts] ; 16 September 1891 – 24 December 1980) was a German grand admiral and convicted war criminal who, following Adolf Hitler's suicide during the Second World War in April 1945, succeeded him as head of state of Nazi Germany. He held the position until the dissolution of the Flensburg Government following Germany's unconditional surrender to the Allies weeks later. As Supreme Commander of the Navy beginning in 1943, he played a major role in the naval history of the war.

He began his career in the Imperial German Navy before the First World War. In 1918 he was commanding UB-68, and was captured as a prisoner of war by British forces. As commander of UB-68, he attacked a convoy in the Mediterranean while on patrol near Malta. Sinking one ship before the rest of the convoy outran his U-boat, Dönitz began to formulate the concept of U-boats operating in attack groups Rudeltaktik (German for "pack tactic", commonly called a "wolfpack") for greater efficiency, rather than operating independently.

SMS M68 was a M1916 type minesweeper built for the Imperial German Navy during the First World War. She entered service on 6 October 1917, but was mined and sunk off Latvia on 29 October 1917. The ship was salvaged by Latvia and entered service with the Latvian Navy on 10 November 1921 under the name Virsaitis as its first vessel. She was taken over by the Soviet Navy in August 1940 when the Soviet Union occupied Latvia in August 1940, serving as T-297 and was sunk by a mine on 2 December 1941.
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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.

Both Germany and Britain relied on food and fertilizer imports to feed their populations, and raw materials to supply their war industry. The British Royal Navy was superior in numbers and could operate on most of the world's oceans because of the British Empire, whereas the Imperial German Navy surface fleet was mainly restricted to the German Bight, and used commerce raiders and submarine warfare to operate elsewhere.

Generalfeldmarschall (German: [ɡenəʁaːlˈfɛltmaʁʃal] ; from Old High German marahscalc, "marshal, stable master, groom"; English: general field marshal, field marshal general, or field marshal; often abbreviated to Feldmarschall) was a rank in the armies of several German states and the Holy Roman Empire, (Reichsgeneralfeldmarschall); in the Habsburg monarchy, the Austrian Empire and Austria-Hungary, the rank Feldmarschall was used. The rank was the equivalent to Großadmiral (English: Grand Admiral) in the Kaiserliche Marine and Kriegsmarine, a five-star rank, comparable to OF-10 in today's NATO naval forces.