...out of the main channel. A thick haze and an entire call favored the movement. The Powhatan and the Canandaigua, the two most powerful vessels on the blockade, were temporarily absent, coaling at Port Royal , leaving only one vessel of size built for war purposes, the Housatonic, with nine other vessels blockading. The others, except the gunboats Ottawa and Unadilla, were purchased vessels whose steam-...