"Hannover" put to sea during the Battle of Dogger Bank on 24January 1915 to support the beleaguered German battlecruisers, but quickly returned to port. On 17–18 April, "Hannover" supported a minelaying operation off the Swarte Bank by the light cruisers of IIReconnaissance Group. A fleet advance to the Dogger Bank followed on 21–22 April. On 16May, "Hannover" was sent to Kiel to have one of her 28 cm guns replaced. The ship returned to Kiel on 28June to have supplemental oil firing installed for her boilers; work lasted until 12July. "KzS" Gottfried von Dalwigk zu Lichtenfels replaced Mauve on 11August, raising his flag aboard "Hannover" on the 20th. On 11–12 September, IIReconnaissance Group conducted another minelaying operation off the Swarte Bank with "Hannover" and the rest of IISquadron in support. This was followed by another fruitless sweep by the fleet on 23–24 October. During the fleet advance of 5–7 March 1916, "Hannover" and the rest of IISquadron 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.