Between 1915 and 1917, how did the strategies the germans used at sea differ from those of the allied powers?

German planning, beginning in 1896, was predicated on the numerical inferiority of the German Navy versus that of the British and sought the same goal of decisive battle. By 1905 German strategy rested on a defense of their major ports against a close blockade through placing the battle fleet in the region of Heligoland Bight and in the principle naval bases of the North Sea.

During 1915-1917, the Germans made U-boats to strengthen their naval power which they thought would lead to their victory in the war. I hope my answer has come to your help. Thank you for posting your question here in .