On 1 April 1914 he joined the Imperial Navy as a Seekadett. After the outbreak of World War I, von Friedeburg, promoted to the rank of Fähnrich zur See (Officer Aspirant) served on the dreadnought Kronprinz and took part in the 1916 Battle of Jutland against the British Royal Navy's Grand Fleet. Elevated to Leutnant zur See, he joined the U-boat forces as naval officer on SM U-114 from June to November 1918.