Percival Drayton became commanding officer of the sloop of war and was active in inshore operations in the waters of South Carolina, Georgia and northern Florida through the summer of 1862. He was promoted to Captain in July of that year. In September 1862, he was given command of the ironclad , overseeing her outfitting and working with John Ericsson to improve elements of monitor design. Drayton commanded his ship in attacks on Forts McAllister and Sumter in March and April 1863, experiences that reinforced his opinion concerning the limitations of the monitor type when fighting against well-defended fortifications.