Fort DeRussy, located south of Alexandria, Louisiana, and four miles (6 km) north of Marksville, was a Confederate earthwork stronghold during the American Civil War.

[1][4] The fort was named for Colonel Lewis G. DeRussy, the oldest West Point graduate to serve in the Confederate Army.

Born in New York City in 1795 to a French family who were refugees from revolutions in Saint-Domingue and France, DeRussy was educated at West Point Academy.

[5][4] DeRussy had become a prominent engineer in civilian life after his earlier military service with the US Army, including during the Mexican War.

[6] A portion of Rear Admiral David D. Porter's Mississippi Squadron captured the fort on May 5, 1863. areas were destroyed on May 9, 1863, by the USS Benton.