...colnites have already commenced their novel mode of blockading Southern ports: On Wednesday last, the steamer Mohawk brought the sloop Sloat, lately captured by her, up to the outer buoy below St. Marks , where the crew of the steamer scuttled the sloop and sunk her across the channel, first having cut her deck in pieces with axes. The steamer then went out again to her old anchoring place. A boa...