In July and August, "Thunder" took part in the Walcheren Campaign. On 22 August , , and "Thunder" were by the town of Doel and fired mortar shells to deter the French from throwing up a battery. Through the 30th the bomb vessels continued to shell the battery, and also enemy troops on the other side of the Scheldt. During the first week in September the British started to withdraw, ending their Walcheren campaign, having sustained heavy losses to disease and having nothing to show for their efforts.