sentences:  After Libau was seized, IV Squadron relocated there as it provided an advance base closer to the front line.The ships were also used to guard the mouth of the Elbe in the North Sea in the first year of the war.The "Wittelsbach" class supported the Battle of the Gulf of Riga in August 1915, but did not take an active role in the attack before it broke down in the face of determined Russian resistance.