Question: The fort visible from the Cooper River was notable for battles in what war?

Context paragraphs:
Cooper River (New Jersey): The Cooper River is a tributary of the Delaware River in southwestern New Jersey in the United States.

W257BQ: W257BQ (99.3 FM) is an American radio station serving the Charleston, South Carolina, area with a Mainstream urban format simulcast on the HD-2 channel of WMXZ.  This station is under ownership of Apex Broadcasting.  Its studios are located in Charleston (east of the Cooper River) and the transmitter tower is in Charleston as well (west of the Ashley River).

Santee Cooper Country: Santee Cooper Country is a tourism district in the south central South Carolina area surrounding the Santee Cooper Lakes, Lake Moultrie and Lake Marion, which were formed from damming the Santee River and the Cooper River .  It was created by the state legislature in 1962.  The district was formed to create and expand tourism, recreation and development in the 5 county region, which includes the counties of Berkeley, Calhoun, Clarendon, Orangeburg and Sumter.

John P. Grace Memorial Bridge: The John P. Grace Memorial Bridge, or the Cooper River Bridge as it was familiarly known, was a cantilever bridge that crossed the Cooper River in Charleston, South Carolina.  It opened on August 8, 1929 and was built by the Cooper River Bridge Company.  Shortridge Hardesty of Waddell & Hardesty, New York City designed the bridge.

Wando River: The Wando River is a tidewater river in the coastal area of South Carolina.  It begins in the town of Awendaw and empties into the Cooper River at Charleston Harbor.  Its drainage area is 73061 acre .  in PHF.  Drum Island is an island located under the bridges between the Wando River and Towne creek.

Cooper River (South Carolina): The Cooper River is a mainly tidal river in the U.S. state of South Carolina.  The South Carolina cities of Mt. Pleasant, Charleston, North Charleston, Goose Creek, Moncks Corner, and Hanahan are located along the river.  Short and wide, it is joined first by the blackwater East Branch, then farther downstream, the tidal Wando River.  Almost immediately thereafter, the river widens into its estuary, uniting with the Ashley River to form the Charleston Harbor.

Fort Sumter: Fort Sumter is a sea fort in Charleston, South Carolina, notable for two battles of the American Civil War.  It was one of a number of special forts planned after the War of 1812, combining high walls and heavy masonry, and classified as Third System, as a grade of structural integrity.  Work started in 1829, but was incomplete by 1860, when South Carolina seceded from the Union.

Ashley River (South Carolina): The Ashley River is a blackwater / tidal river in South Carolina, rising from the Wassamassaw and Great Cypress Swamps in western Berkeley County.  It consolidates its main channel about five miles west of Summerville, widening into a tidal estuary just south of Fort Dorchester.  The river then flows for approximately 17 miles along the historical banks of the City of North Charleston before reaching peninsular Charleston.  The much wider Ashley joins the Cooper River off the Battery in Charleston to form Charleston Harbor before discharging into the Atlantic Ocean.  At the present time the land around the Ashley River or in Ashley Barony, as the original land grant was called, is mostly undeveloped.

The Battery (Charleston): The Battery is a landmark defensive seawall and promenade in Charleston, South Carolina.  Named for a civil-war coastal defense artillery battery at the site, it stretches along the lower shores of the Charleston peninsula, bordered by the Ashley and Cooper Rivers, which meet here to form Charleston harbor.  Historically, it has been understood to extend from the beginning of the seawall at the site of the former Omar Shrine Temple (40-44 East Bay Street) to the intersection of what is now Murray Boulevard and King Street.  The higher part of the promenade, paralleling East Battery, as the street is known south of Water Street, to the intersection of Murray Boulevard, is known as High Battery.  Fort Sumter is visible from the Cooper River side (High Battery) and from the point, as are Castle Pinckney, the World War II aircraft carrier USS Yorktown (CV-10), Fort Moultrie, and Sullivan's Island.

Cooper River Historic District: Cooper River Historic District is a national historic district located along the East and West Branches of the Cooper River near Moncks Corner, Berkeley County, South Carolina.  It encompasses 32 contributing buildings, 77 contributing sites, 8 contributing structures, and 4 contributing objects and is a remarkably intact historic and cultural landscape.  The district includes many historic buildings, structures, and objects from the 18th, 19th, and 20th centuries and archaeological remains of settlements, machines, barns, and other structures that supported agricultural activity.  In addition, there are landscape features dating to the 18th and 19th centuries such as rice fields, banks, canals, dams, reservoirs or reserves, causeways, roads, avenues, upland fields, fence lines, and cemeteries.

Supporting paragraphs: The Battery (Charleston) Fort Sumter
Answer: American Civil War