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.