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Karl Dönitz was a German navy officer who, following Adolf Hitler's suicide, succeeded him as head of state in May 1945, holding the position until the dissolution of the Flensburg Government following Germany's unconditional surrender to the Allies days later. As Supreme Commander of the Navy beginning in 1943, he played a major role in the naval history of World War II. He began his career in the Imperial German Navy before World War I. In 1918, he was commanding UB-68, and was taken 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 for greater efficiency, rather than operating independently. By the start of the Second World War, Dönitz was supreme commander of the Kriegsmarine's U-boat arm. In January 1943, Dönitz achieved the rank of Großadmiral and replaced Grand Admiral Erich Raeder as Commander-in-Chief of the Navy. Dönitz was the main enemy of Allied naval forces in the Battle of the Atlantic. From 1939 to 1943 the U-boats fought effectively but lost the initiative from May 1943. Dönitz ordered his submarines into battle until 1945 to relieve the pressure on other branches of the Wehrmacht. 648 U-boats were lost—429 with no survivors. Furthermore, of these, 215 were lost on their first patrol. Around 30,000 of the 40,000 men who served in U-boats perished. On 30 April 1945, following the suicide of Adolf Hitler and in accordance with his last will and testament, Dönitz was named Hitler's successor as head of state in what became known as the Goebbels cabinet after his second-in-command, Joseph Goebbels, until Goebbels' suicide led to Dönitz's cabinet being reformed into the Flensburg Government instead. On 7 May 1945, he ordered Alfred Jodl, Chief of Operations Staff of the Oberkommando der Wehrmacht (OKW), to sign the German instruments of surrender in Reims, France, formally ending the War in Europe. Dönitz remained as head of state with the titles of President of Germany and Supreme Commander of the Armed Forces until his cabinet was dissolved by the Allied powers on 23 May de facto and on 5 June de jure. By his own admission, Dönitz was a dedicated Nazi and supporter of Hitler. Following the war, he was indicted as a major war criminal at the Nuremberg trials on three counts: conspiracy to commit crimes against peace, war crimes, and crimes against humanity; planning, initiating, and waging wars of aggression; and crimes against the laws of war. He was found not guilty of committing crimes against humanity, but guilty of committing crimes against peace and war crimes against the laws of war. He was sentenced to ten years' imprisonment; following his release, he lived in a village near Hamburg until his death in 1980.