...umn that was to ascend to Stono, cover its landing, and shell James's Island. 3. To guard the depots of the army at Hilton Head and at Seabrook during the withdrawal of the troops concentrated on Folly Island . I should here state that Mr. Ericsson had decided to increase the thicknesses of the pilot-houses of all the monitors, and add heavy circles of metal to the bases of the turrets and pilot-houses. ...