Following the secession of
Virginia and that state joining the
Confederacy, Federal troops marched from Washington into the
Arlington region of northern Virginia. The move was intended to forestall any attempt by
Virginia militia or
Confederate States Army to seize the capital city of the United States. Over the next seven weeks, forts were constructed along the banks of the
Potomac River and at the approaches to each of the three major bridges (
Chain Bridge,
Long Bridge, and
Aqueduct Bridge) connecting Virginia to Washington and
Georgetown. While the Potomac River forts were being built, planning and surveying was ordered for an enormous new ring of forts to protect the city. Unlike the fortifications under construction, the new forts would defend the city in all directions, not just the most direct route through
Arlington. In mid-July, this work was interrupted by the
First Battle of Bull Run. As the
Army of Northeastern Virginia marched south to
Manassas, the soldiers previously assigned to construction duties marched instead to battle. In the days that followed the Union defeat at Bull Run, panicked efforts were made to defend Washington from what was perceived as an imminent Confederate attack. The makeshift trenches and earthworks that resulted were largely confined to Arlington and the direct approaches to Washington. On July 26, 1861, five days after the battle,
Maj. Gen. George B. McClellan was named commander of the military district of Washington and the subsequently renamed
Army of the Potomac. Upon arriving in Washington, McClellan was appalled by the condition of the city's defenses. "In no quarter were the dispositions for defense such as to offer a vigorous resistance to a respectable body of the enemy, either in the position and numbers of the troops or the number and character of the defensive works... not a single defensive work had been commenced on the Maryland side. There was nothing to prevent the enemy shelling the city from heights within easy range, which could be occupied by a hostile column almost without resistance." To remedy the situation, one of McClellan's first orders upon taking command was to greatly expand the defenses of Washington. At all points of the compass, forts and entrenchments would be constructed in sufficient strength to slow an attack and buy time for reinforcements to arrive and bolster the city's defenses.
Brigadier General John G. Barnard, was named chief engineer of the Department of Washington, and would supervise the construction and maintenance of the forts before being named chief engineer of the armies in the field by
Ulysses S. Grant in 1864. and
Fort Reno in the District of Columbia. The line bisecting the fort is the border between the
District of Columbia and
Maryland. Prior to the outbreak of war, the Great Falls Turnpike, also known as
River Road, was an important traffic artery for trade entering the District of Columbia from western Maryland and beyond. It connected the village of Tenleytown with the city of Washington, and roughly paralleled the Potomac River before turning northward. Due to its strategic position along the river, which formed the border between the
Confederate state of Virginia and the
Union state of Maryland, it had great military value and was a likely route for an attacking army, as would be proved three years after the outbreak of war during the
Battle of Fort Stevens. To prevent a Confederate force from advancing on Washington along the Potomac, several forts were constructed on hills near the river. To guard River Road, which was the most direct route into the city,
U.S. Army engineers built a small, round fort at the point where River Road crossed into the district of Columbia. With a perimeter of only 123 yards and mounting only six guns, it was located forward of
Fort Reno, the largest fort protecting the Tenleytown area. Details of the actual construction process are scarce, though a letter from a member of the
Ninth New York Heavy Artillery regiment to the
Democratic Press newspaper indicates that the fort was at least partially built with labor from that regiment. In April 1863, the fort was named in honor of the recently deceased
Brigadier General George Dashiell Bayard, who had been killed on December 13, 1862, at the
Battle of Fredericksburg. At the time of its dedication, the fort was roughly complete. Round in shape and surrounded by trenches and
abati, the fort's guns faced north, overlooking River Road. A service road crossed the trenches in the southern half of the fort, connecting with River Road behind the fort. Rifle pits extended northeast to
Fort Reno and southwest to Fort Simmons. A small battery of guns, named
Battery Bayard, was an
outwork of the fort and covered a blind spot in the ravine to the northwest of the fort. == Wartime use ==