Battle of Roanoke Island - Background

Background

Northeastern North Carolina is dominated by its sounds; large but shallow bodies of brackish-to-salt water that lie between the mainland and the Outer Banks. Although they are all one body, intimately connected and having a common water level, they are conceptually divided into several distinct regions. The largest of these is Pamlico Sound, immediately behind Hatteras Island; to its north is the second largest, Albemarle Sound, which extends almost to the southern border of Virginia. The linkage between these two, somewhat narrow, is further constricted by Roanoke Island. The portion of the waterway between Roanoke Island and the mainland is known as Croatan Sound. Both the island and the sound are about ten miles (16 km) long. The sound at its widest point is a little more than 4 miles (6.4 km) across, the island about half that. On the eastern side of the island is Roanoke Sound, much narrower, shallower, and less important.

Several North Carolina cities were sited on the sounds, among them New Bern (usually written New Berne in the mid-nineteenth century), Beaufort, Edenton, and Elizabeth City. Others, not lying directly on the sounds, were accessible to the rivers that emptied into them. As much as a third of the state is in their watershed. Through most of the first year of the Civil War, the Confederate forces retained control of the sounds, so that coastwise water-borne commerce of the eastern part of the state was unimpeded. The sounds were linked to Norfolk, Virginia by the Albemarle and Chesapeake Canal and the Dismal Swamp Canal. The blockade of Norfolk could not be complete so long as cargoes could reach the city through its back door. Communications were not affected appreciably when Federal forces captured the forts on the Outer Banks at Hatteras Inlet in August 1861, as the Union Navy could not bring its deep-water vessels into the sounds through the shallow inlets.

Roanoke Island was the key to control of the Sounds. If controlled by the Union forces, they would have a base that could be attacked only by an amphibious operation, which the Rebels could not mount. If the Union established naval superiority there, all points on the mainland shores would be equally vulnerable to assault. The Confederate defenders would be forced into an impossible situation: they would either have to give up some positions without a fight, or they would have to spread their assets too thin to be of any use.