 Complete the following phrase:  At the outbreak of World War I in August 1914, Stettin was serving in the North Sea with the High Seas Fleet. On 6 August, she and the cruiser escorted a flotilla of U-boats into the North Sea in an attempt to draw out the British fleet, which could then be attacked by the U-boats. The force returned to port on 11 August, without having encountered any British warships. Some two weeks later, on 28 August, Stettin was involved in the 