"Schleswig-Holstein" then participated in a fleet advance to the Dogger Bank on 21–22 April 1915. On 11–12 September II Reconnaissance Group conducted a minelaying operation off the Swarte Bank with II Squadron in support. This was followed by another sweep by the fleet on 23–24 October that ended without result. II and III Battle Squadron dreadnoughts conducted an advance into the North Sea on 5–7 March 1916; "Schleswig-Holstein" and the rest of II Squadron remained in the German Bight, ready to sail in support. They then rejoined the fleet during the operation to bombard Yarmouth and Lowestoft on 24–25 April. During this operation, the battlecruiser was damaged by a British mine and had to return to port prematurely. Visibility was poor, so the operation was quickly called off before the British fleet could intervene.