On 15 May 1916, "Princess Margaret" laid mines off the Belgian coast to reinforce the existing minefields. "Princess Margaret" and "Paris" laid mines near the Thornton Ridge on 24 May 1916, and on 4 August 1916, the British light cruiser stuck a mine off the Thornton Ridge, probably from this minefield. On 18 May 1916, as a response to the German Bombardment of Yarmouth and Lowestoft on 24 April that year, "Princess Margaret", "Paris" and "Biarritz" laid a defensive minefield between Lowestoft and Caister to prevent further attacks by German surface warships. On 28 November 1916 "Princess Margaret" returned to operations in the Bight when, escorted by the destroyers , and , she laid 500 mines west of Borkum.