The ships also saw service in the Baltic Sea against the Russian Empire during the war; "Nassau" and "Posen" engaged the Russian pre-dreadnought during the inconclusive Battle of the Gulf of Riga in 1915. "Rheinland" and "Westfalen" were sent to Finland to support Finnish forces rebelling against Soviet rule, though "Rheinland" ran aground and was badly damaged. Following Germany's defeat, all four ships were ceded as war prizes to the victorious Allied powers and broken up in the early 1920s.