In 1744, part of a squadron under Admiral John Norris, Roebuck escorted a large convoy en route to Lisbon but became separated when she went in pursuit of an enemy vessel. She arrived in the Tagus after the convoy to find that Norris’ ships had already left for home. She was subsequently blockaded there by a French fleet until rescued on 9 September, after which, she transferred to the Mediterranean, joining Admiral William Rowley's fleet in operations against Genoa.
