Hermann Bauer (22 July 1875 – 11 February 1958) was a German naval officer who served as commander of the U-boat forces of the Kaiserliche Marine during World War I. In addition to his World War I career, Bauer is well known as the author of the book Das Unterseeboot, a treatise on the design and operation of U-boats, which was later translated into English by Hyman G. Rickover. Rickover's translation became a basic text for the US submarine service. Career Bauer joined the Kaiserliche Marine as a cadet in April 1892, completing his basic training aboard the sailing frigate , before attending the Naval Academy in 1892–1893. He continued his training on the ship and the cruiser . After a second period of study at the Naval Academy in 1894-1895 Bauer was promoted to Unterleutnant zur See on 15 September 1895 and subsequently served on the battleship . In 1897 Bauer served on the frigate before transferring to the light cruiser as a deck officer. On 12 April 1899 he was promoted to Leutnant zur See and then served as watch officer on the torpedo training ship . From October 1900 to September 1903, he served as a company officer, deck officer, first officer, and then the commander of the II. Torpedo-Abteilung ("2nd Torpedo Division"). Bauer served for more than a year as commander of the II. Torpedo-Abteilung, and was simultaneously commander of Torpedodivisionsbootes D9, Flag Lieutenant of II. Torpedobootsflottille, and Flag Lieutenant and commander of the torpedo boat S125. On 1 April 1904 he was promoted to Kapitänleutnant. Between October 1906 and September 1908 Bauer served in the shipbuilding department of the Reichsmarineamt, and subsequently served as a navigation officer aboard the cruiser . He was promoted to Korvettenkapitän on 16 October 1909. He served as first officer of the battleship for a year, then spent two and a half years as adjutant of the Imperial Shipyard at Wilhelmshaven. Between November 1913 and March 1914 Bauer commanded the light cruiser . He was then transferred to the U-boat arm, where he served as commander of I. Unterseebootsflottille, and during World War I served as Führer der Unterseeboote ("Commander of Submarines") until 4 June 1917, and as such was promoted to Fregattenkapitän on 16 April 1915. On 24 July 1917 he was appointed commander of the battleship and on 14 October 1917 was promoted to Kapitän zur See. Bauer