sentences:  By 1910, with the arrival of the first dreadnought battleships, the "Wittelsbach"-class ships were removed from front-line service and relegated to training duties or simply laid up in reserve.With the outbreak of World War I in July 1914, the ships returned to active service as IV Battle Squadron, seeing guard duty in the North Sea and limited operations in the Baltic Sea against Russian forces.These operations included supporting the attack on Libau in May 1915 and the Battle of the Gulf of Riga in August that year.