"Lion" became the flagship of Vice-Admiral W. C. Pakenham in December 1916 when he assumed command of the Battlecruiser Fleet upon Beatty's promotion to command of the Grand Fleet. "Lion" had an uneventful time for the rest of the war conducting patrols of the North Sea as the High Seas Fleet was forbidden to risk any more losses. She provided support for British light forces involved in the Second Battle of Heligoland Bight on 17 November 1917, but never came within range of any German forces. "Lion" and "Princess Royal", along with the rest of the Grand Fleet, sortied on the afternoon of 23March 1918 after radio transmissions had revealed that the High Seas Fleet was at sea after a failed attempt to intercept the regular British convoy to Norway. The Germans were too far ahead of the British and escaped without firing a shot. When the High Seas Fleet sailed for Scapa Flow on 21 November 1918 to be interned, "Lion" was among the escorting ships. Along with the rest of the 1st BCS, "Lion" and "Princess Royal" guarded the interned ships until both ships were assigned to the Atlantic Fleet in April 1919.