Fort Defiance (formerly also known as Fort Sevier and Fort Bruce) was a

fort A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere'' ...

built during the

American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by state ...

Clarksville, Tennessee Clarksville is the county seat of Montgomery County, Tennessee, United States. It is the fifth-largest city in the state behind Nashville, Memphis, Knoxville, and Chattanooga. The city had a population of 166,722 as of the 2020 United States ...

, on the

Cumberland River The Cumberland River is a major waterway of the Southern United States. The U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed June 8, 2011 river drains almost of southern Kentucky and ...

. It changed hands several times during the war, and is now preserved by the city administration.

Construction and Union takeover

In November 1861, Confederate troops began to build a defensive fort that would control the river approach to Clarksville. They mounted three guns in the fort. On February 19, 1862,

Union Union commonly refers to: * Trade union, an organization of workers * Union (set theory), in mathematics, a fundamental operation on sets Union may also refer to: Arts and entertainment Music * Union (band), an American rock group ** ''Un ...

gunboats A gunboat is a naval watercraft designed for the express purpose of carrying one or more guns to bombard coastal targets, as opposed to those military craft designed for naval warfare, or for ferrying troops or supplies. History Pre-stea ...

came up the river from

Fort Donelson Fort Donelson was a fortress built early in 1862 by the Confederacy during the American Civil War to control the Cumberland River, which led to the heart of Tennessee, and thereby the Confederacy. The fort was named after Confederate general Dani ...

and reported the fort displayed a white flag and was de