 Complete the following phrase:  The High Seas Fleet in October 1918 was built around the core of 18 battleships and 5 battlecruisers, most of which had been completed before the outbreak of war. Since the Battle of Jutland in May 1916, the obsolete pre-dreadnoughts had been de-commissioned, two new battleships with 15-inch guns  and  and the new battlecruiser had joined the fleet, but one dreadnought battleship had been damaged beyond repair by running aground in the Baltic. The fleet had undertaken only three major sorties at full strength into the North Sea since June 1916: 