 In 1796, when in command of the letter of marque schooner "Favorite", of Martinique, he was very severely wounded and his ship was taken by a French privateer of very superior force after a fierce engagement of one hour and twenty minutes' duration.In 1798 he was in command of the "General Keppel", also of Martinique, which was capsized in a white squall on passage from Philadelphia, when Lennon and some of his crew were rescued by a passing schooner, after suffering great perils and hardships.Lennon performed various daring feats in the West Indies in 1806–9; but his most remarkable exploits were in "Hibernia", a Cowes-built barque, carrying six guns and about twenty-two men and boys all told, in which he traded for some years from the West India island of St. Thomas.