 Complete the following phrase:  The following month, the naval high command began an operation against the Gulf of Riga in support of the GorliceTarnów Offensive that the Army was waging. The Baltic naval forces were reinforced with significant elements of the High Seas Fleet, including I Battle Squadron, I Scouting Group, II Scouting Group, and II Torpedo-boat Flotilla. Prince Heinrich planned that Schmidts ships would force their way into the Gulf and destroy the Russian warships in Riga, while the heavy units of the High Seas Fleet would patrol to the north to prevent any of the main Russian Baltic Fleet that might try to interfere with the operation. The Germans launched their attack on 8 August, initiating the 