Wood served with distinction in the Mediterranean from 1806 until 1808; he then went to Portugal, took part in Sir John Moore's campaign, was at the Battle of Coruña on 16January 1809, and returned with the British army to England. In July he was in the expedition under the Earl of Chatham to Walcheren, and was at the siege of Flushing and its capture on 14August. He was knighted on 22May 1812. He commanded the Royal Artillery of the army under Sir Thomas Graham (afterwards Lord Lynedoch), which co-operated with the allies in Holland and Flanders. Landing at Rotterdam in December 1813, he was at the Siege of Antwerp in January 1814, and at the action of Merxem on 13January 1814. He was at the unsuccessful assault on Bergen op Zoom on 8March, and the subsequent blockade of that place and of Antwerp. For his services he received brevet promotion, and was made an "aide-de-camp" to King George IV.