Friedrich Ruge was the son and grandson of German educators. Joining the
Imperial German Navy as a cadet in March 1914, he was soon a participant in the 1914, 1915, and 1916 Baltic Sea operations. In 1917 and 1918, he sailed with the destroyer raids in the North Sea and English Channel. After the armistice, Ruge was an officer aboard the destroyer , interned at
Scapa Flow and in June 1919, he played a role in the
scuttling of the German Fleet. Returning to Germany to continue his naval career in the service of the new
Weimar Republic, for the next two decades he concentrated on mines and mine warfare. From 1921 to 1923, he commanded a minesweeper. After studies at the
Technische Hochschule in Charlottenburg (now
Technische Universität Berlin) from 1924 and 1926, Ruge was appointed to the minesweeper . From 1928 to 1932, he had staff roles associated with mine and torpedo warfare, and in September 1932 became commanding officer of the 1st Half-Flotilla of minesweepers. Ruge returned to staff duties in 1934. In the UK during the 1930s he met a British ex-sailor at a regatta, Lt Aubrey Grey, whose ship, , was sunk in 1917 by the , the ship that Ruge had been serving on. The
V100 was the ship that rescued Grey from the water after the sinking and the pair became friends after meeting, their friendship only interrupted by World War II. On 1 June 1937, Ruge was appointed
Führer der Minensuchboote (FdM), (Commander of Minesweepers). ==World War II==