 Complete the following phrase:  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 1718 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 2122 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 1112 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 2324 October. During the fleet advance of 57 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 