Fort Corcoran, Civil War fortification in Arlington County, United States
Fort Corcoran was a Union fortification near Aqueduct Bridge featuring earthwork and wood defenses spanning approximately 575 feet. The installation held positions for 10 guns, including howitzers and Parrott rifles, and functioned as headquarters for the Union Army's defensive operations south of the Potomac River.
Built by the Union Army in 1861, the installation served as a key defensive position until 1866. Its five years of operation made it central to Washington's southern defensive perimeter throughout the Civil War.
The 69th New York Infantry, commanded by Colonel Michael Corcoran, built this installation with Father Thomas Mooney performing blessing ceremonies for the cannons. This blend of military duty and religious practice reflected the values of the Irish-American soldiers who served there.
A historical marker at the intersection of Key Boulevard and North Ode Street in Arlington identifies the former site. Nearby museums and local resources provide additional information about this installation and its role in Civil War defenses.
President Abraham Lincoln visited to observe artillery practice and watched a howitzer successfully destroy its target during a demonstration. This presidential observation highlighted the installation's importance to the Union.
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