 Complete the following phrase:  On 2324 October, the High Seas Fleet undertook its last major offensive operation under the command of Admiral Pohl, though it ended without contact with British forces. Weakened by hepatic cancer and unable to carry out his duties, he was replaced by Vice Admiral Reinhard Scheer in January. Scheer proposed a more aggressive policy designed to force a confrontation with the British Grand Fleet; he received approval from the Kaiser in February. Scheers first operation was a sweep into the North Sea on 57 March, followed by two more on 2122 March and 2526 March. During his next operation, Oldenburg supported 