This service continued until early 1809, when she returned to Britain. By now Britain was heavily involved in the Baltic, protecting mercantile interests. An expedition under Sir James Gambier in July 1807 had captured most of the Danish Navy at the Second Battle of Copenhagen, in response to fears that it might fall into Napoleon's hands, at the cost of starting a war with Denmark. Captain Hamilton left the ship, and was superseded by Captain Edward Sneyd Clay. "Temeraire" now became the flagship of Rear Admiral Sir Manley Dixon, with orders to go to the Baltic to reinforce the fleet stationed there under Sir James Saumarez. "Temeraire" arrived in May 1809 and was sent to blockade Karlskrona on the Swedish coast.