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
Battle of Fort Sumter that all property in Charleston harbor had reverted to South Carolina upon that state's secession as an independent commonwealth. This debate ran alongside another discussion about how aggressively the installations—including Forts Sumter and Pickens—should be obtained. President Davis, like his counterpart in Washington, preferred that his side not be seen as the aggressor. Both sides believed that the first side to use force would lose precious political support in the border states, whose allegiance was undetermined; before Lincoln's inauguration on March 4, five states had voted "against" secession, including Virginia, and Lincoln openly offered to evacuate Fort Sumter if it