Fort Foote - Planning

Planning

In the opening days of the American Civil War, the defenses of Washington D.C. were primarily concerned with an overland attack on the capital city of the United States. In 1861, the Arlington Line was constructed to help defend the city from attack via the direct, Virginia approach. Additional forts were constructed on the city's northern approaches to defend against any attacks from Maryland. At sea, however, only Fort Washington, a fort originally built to defend the city in the War of 1812 blocked the approach along the Potomac River.

Fort Washington's vulnerability was highlighted in the 1862 clash of the USS Monitor and the CSS Virginia, two wholly ironclad ships. Although the Virginia never attacked Union ships again, Washingtonians were concerned that an ironclad similar to the Virginia might be able to slip past the isolated guns of Fort Washington and begin a bombardment of the city. They were also concerned with the potential intervention of European nations on the side of the Confederacy, possibly adding a major naval threat to the city. A commission appointed by Secretary of War Edwin Stanton to examine the defenses of Washington came to the conclusion that although sufficient defensive works had been constructed in order to defend the city from land attack, the city was still vulnerable to attack from the water.

"The commission furthers their opinion that the Defense of Washington cannot be considered complete without the defense of the river against an enemy's armed vessels. Foreign intervention would bring against us always in superior naval force on the Potomac, and we are, even now, threatened with Confederate iron-clads fitted in English Ports. ...and by constructing a battery of ten guns and a covering work on the opposite shore of the Potomac, at near Roziers Bluff . An examination been made, revealing a most favorable and strong position on that side, easily communicated with by water. Surveys are in progress."

Then-colonel John Gross Barnard, the chief military engineer for the defenses of Washington, went to work on the commission's recommendation with haste. Rosiers Bluff, a 100-foot (30 m) high Maryland cliff six miles (10 km) south of the city, and pointed out in the commission's report was found to be an excellent site for the new fort. The layout would largely follow the plans laid out in West Point instructor Dennis Mahan's A Treatise on Field Fortification, which said

"As a field fort must rely entirely on its own strength, it should be constructed with such care that the enemy will be forced to abandon an attempt to storm it, and be obliged to resort to the method of regular approaches used in the attack of permanent works. To effect this, all the ground around the fort, within range of the cannon, should offer no shelter to the enemy from its fire; the ditches should be flanked throughout; and the relief be so great as to preclude any attempt at scaling the work."