 Complete the following phrase:  The ship rejoined the fleet in late 1916, though by this time the Germans had abandoned their strategy of raids with the surface fleet in favor of the U-boat campaign. As a result, Derfflinger and the rest of the High Seas Fleet saw little activity for the last two years of the war apart from patrol duty in the German Bight. The fleet conducted one final operation in April 1918 in an unsuccessful attempt to intercept a British convoy to Norway. After the end of the war in November 1918, the fleet was interned in Scapa Flow. On the order of Rear Admiral Ludwig von Reuter, the interned ships were 