Fortifications over Cumberland River at Fort Donelson, Dover, TN

Fort Donelson was built in 1861 to defend the river approach to Middle Tennessee.  It came under seige in February 1862, by a joint army-navy force under the command of General U.S. Grant, a relative unknown at this time.  Lack of cohesion among the Confederate Generals led to their surrender after a three day battle, sending 12,000 to 15,000 troops upriver to Union prison camps.