Considered on at least two occasions as a possible Prime Minister, Chatham rejected these approaches due to poor health of his wife. He also turned down the prospect of commanding British troops in Portugal in 1808 at the beginning of the Peninsular War, a command that instead went to Arthur Wellesley. In 1809 he did accept command of an expedition to the island of Walcheren, as part of a plan to strike at a French fleet being assembled in nearby Antwerp. Despite overseeing the largest force Britain had despatched abroad during the war, the expedition became bogged down on the island and began suffering heavy casualty rates due to disease. Chatham was recalled and was subject to an inquiry that largely placed the blame on him.