 The Russian Kasatka-class submarine Okun fired two torpedoes at Augsburg on the night of 28 June, though both missed. Augsburg was assigned to the forces that took part in the Battle of the Gulf of Riga in August 1915. A significant detachment from the High Seas Fleet, including eight dreadnoughts and three battlecruisers, went into the Baltic to clear the Gulf of Riga of Russian naval forces. Augsburg participated in the second attack on 16 August, led by the dreadnoughts Nassau and Posen. On the night of 19 August, Augsburg encountered a pair of Russian gunboats — Sivutch and Korietz; Augsburg and Posen sank Sivutch, though Korietz managed to escape. The Russian surface forces had by this time withdrawn to Moon Sound, and the threat of Russian submarines and mines still in the Gulf prompted the Germans to retreat. On 13 October, an unknown submarine fired a torpedo at Augsburg, though it did not hit her. In September 1916, Augsburg participated in an attempt to force the Irben Strait into the Gulf of Riga in September 1916. Heavy Russian resistance, primarily from the old battleship Slava, forced the Germans to retreat from the Gulf.
