Fort O'Rourke Fair Haven. No visible remains of the fort can be found. Fort O'Rourke Fort O'Rourke is a former Union Army installation now located in the Belle Haven area of Fairfax County in the U.S. state of Virginia. It was the southernmost fort built to defend Washington, D.C. in the American Civil War. Following the surrender of Fort Sumter in Charleston, South Carolina, on April 14, 1861, President Abraham Lincoln declared that "an insurrection existed," and called for 75,000 troops to be called up to quash the rebellion. The move sparked resentment in many other southern states, which promptly moved to
Fort Sumter watched by many civilians in a celebratory spirit. The fort had been cut off from its supply line and surrendered the next day. The Second Battle of Fort Sumter (September 8, 1863) was a failed attempt by the Union to retake the fort, dogged by a rivalry between army and navy commanders. Although the fort was reduced to rubble, it remained in Confederate hands until it was evacuated as General Sherman marched through South Carolina in February 1865. Fort Sumter is open for public tours as part of the Fort Sumter National Monument operated by the National Park Service. Named