 In 1803, Lyons joined the 74-gun , which struck rocks off Brest on 25 March 1804 whilst blockading the French.Lyons then joined the 100-gun , which had been a French ship of the line captured at the Battle of the Nile, for three months until he joined , then Nelson's flagship, on which he was present at the Battle of Trafalgar on 21 October 1805.Lyons then moved to Admiral Lord Collingwood's 98-gun for the blockade of Cadiz, and then to the 74-gun of Captain Charles Rowley, on which he was present for the taking of the island of Capri from Napoleon in May 1806.