...ork, which is set off against a vessel at a distance of a mile. Fort Gaines, on Dauphin Island mounts twenty-two guns; Fort Morgan, on the main land, one hundred and twenty guns; Fort Grant, at Grant's Pass , on the northwest side of Dauphin Island, three guns; while at the mouth of Spanish river a heavy iron-clad battery, mounting 10 inch and 11 inch guns, and at Dog river a formidable sand battery comm...