|Teg: Suntingan mudah alih
entered the [[Kaiserliche Marine]] in 1907 as a cadet. During the [[First World War]] he served as a commander of [[torpedoboat]]s. When the German fleet surrendered to the British he commanded a squadron of torpedo boats, with this he partook in the [[Scuttling of the German fleet in Scapa Flow]], after which he was taken prisoner by the British.
After being released Schniewind continued to serve in the [[Reichsmarine ]]. From 1925 to 1926 he served as adjutant to the Minister of War [[Otto Gessler ]]. In 1932 Schniewind became captain of the light cruiser [[German cruiser Köln|''Köln '']]. In 1934 Schniewind was appointed to another staff function. He was promoted to rear admiral in 1937 and to vice admiral in 1940.
He served as Chief of Staff of the [[Seekriegsleitung ]] from 1938 to 1941. After the sinking of the [[German battleship Bismarck|''Bismarck '']] Schniewind was appointed as successor to [[Günther Lütjens ]] who was lost with the ship. In 1943 Schniewind became commander of Marinegruppenkommandos Nord. On March 1 , 1944 Schniewind was promoted to [[Generaladmiral ]]. On July 30 , 1944 Schniewind was relieved of command and for the duration of the war he saw no further employment.
After the War he was arrested and prosecuted during the [[High Command Trial]] for his role in the invasion of Norway ( [[Operation Weserübung ]]) but he was acquitted, after which he was released from captivity. From 1949 to 1952 he served with the [[Naval Historical Team]] in [[Bremerhaven ]].