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 first-day cover was issued that day. On June 28, 2015, in the aftermath of the events of June 17, 2015, when a mass shooting took place at Emanuel African Methodist Episcopal Church in downtown Charleston, South Carolina, the five small flags that were arranged in a semi-circle around the large flagpole flying the 50-star United States flag at Fort Sumter were lowered so that the South Carolina flag could be flown at half mast. Those flown include (1) a 33-star United States flag, (2) a Confederate First National Flag (), (3) a South Carolina State Flag, (4) a Confederate Second