[3] On 20 October, U-17 stopped the 866 ton SS Glitra off the Norwegian coast, and having searched her cargo, ordered the crew to the lifeboats before scuttling the vessel.

On 26 October, U-17 torpedoed the French ferry SS Amiral Ganteaume† in the Strait of Dover.

The vessel made port before sinking, with the loss of 40 lives out of over 2,500 on board.

On 12 June 1915, U-17 chased and torpedoed the SS Desabla off the coast of Scotland.

Walther's command ended on 9 January 1916 and the next day U-17 joined the Training Flotilla.