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 Jay 1861 as it entered Charleston Harbor. The incident provoked a crisis, prompting other southern states began to more seriously consider secession from the Union. The second effort, with new Army recruits departing from Fort Columbus on April 9, 1861, also failed when it prompted South Carolina forces to fire on Fort Sumter early in the morning of April 12, 1861, resulting in the start of the Civil War. In the early years of the Civil War, the north barracks were used to hold Confederate officers taken as prisoners of war pending transfer to other Union prisons such as Camp Johnson