|thumb On 23 March 1756 Lockhart was posted to the 28-gun , which he commanded for several cruises in the Channel, capturing several large
privateers of equal or superior force, among them the 22-gun
Cerf with 211 men, the 26-gun
Grand Gideon with 190 men, and the 20-gun
Mont-Ozier of
Rochelle with 170 men. Lockhart was severely wounded in the capture of the
Mont-Ozier on 17 February 1757, and had to be invalided on shore for the next two months. He rejoined the
Tartar and on 15 April, off
Dunnose, Isle of Wight, he captured the 26-gun ''Duc d'Aiguillon
of St. Malo with 254 men; and on 2 November the 36-gun Melampe'' with 320 men. The latter ship was added to the navy as the 36-gun frigate . As a reward for Lockhart's services, the
Admiralty offered him the command of the 50-gun , which was then nearing completion, and making several promotions from
Tartars crew. He was also presented by the merchants of
London and of
Bristol with pieces of
plate 'for his signal service in supporting the trade;’ and by the corporation of
Plymouth with the
freedom of the borough in a gold box. Lockhart spent the next few months recuperating at
Bath and waiting for the
Chatham to be launched. She was duly launched in April 1758 and Lockhart took command, taking many of his officers and men from
Tartar to crew her, with the Admiralty's permission. Lockhart had her fitted for sea by May, and spent June to September cruising against privateers in the North Sea.
Chatham was then ordered into the Channel and later joined the fleet under Sir Edward Hawke. She spent the summer under Rear-Admiral
George Brydges Rodney, taking part in the
Raid on Le Havre before rejoining Hawke in October, and then being sent to join a squadron under Commodore
Robert Duff, to watch the French in
Quiberon Bay. The squadron observed the French fleet sail out, and were chased by them as they rushed to report the news to Hawke. Hawke brought his fleet against them and decisively defeated them at the
Battle of Quiberon Bay on 20 November 1759. Four days later Hawke appointed Lockhart to command in the place of Captain
John Campbell, who was sent home with the despatches. In the end of January 1760 the
Royal George came to
Spithead, and a month later Lockhart was appointed to command the 64-gun , forming part of the fleet under Hawke or
Edward Boscawen. ==Later naval and parliamentary career==