In August 1915, the German fleet attempted to clear the Gulf of Riga to facilitate the capture of Riga by the German Army. To do so, the German planners intended to drive off or destroy the Russian naval forces in the area, which included the pre-dreadnought battleship and a number of gunboats and destroyers. The German naval force would also lay a series of minefields in the northern entrance to the gulf to prevent Russian naval reinforcements from being able to enter the area. The fleet that assembled for the assault included "Nassau" and her three sister ships, the four s, and the battlecruisers , , and . The force would operate under the command of Vice Admiral Franz von Hipper. The eight battleships were to provide cover for the forces engaging the Russian flotilla. The first attempt on 8 August was unsuccessful, as it had taken too long to clear the Russian minefields to allow the minelayer to lay a minefield of her own.