Fort Dickerson came under attack only once during the Civil War. in a prelude to the 1863 Siege of Knoxville, Federal and Confederate cavalry fought for possession of these heights. Its lofty presence, however, served as a deterrent until the end of the War.
Two months prior to the Siege of Knoxville, Confederate troops under GeneralBraxton Bragg defeated Federal forces at the bloody battle of Chickamaugaand then laid siege to the Federal forces which had retreated to Chattanooga. Confederate Major General James Longstreet, during the relative inactivity of the siege, was ordered to march on Knoxville with his First Corps of the Army of Northern Virginia. His orders were to capture or drive out Major General Ambrose E. Burnside and the Army of the Ohio. Longstreet's cavalry under Major General Joseph Wheeler was ordered to push through Blount County and attack the heights on the Holston (now Tennessee) River opposite Knoxville. If the Confederates could capture these heights, Knoxville would be at their mercy.
During the night of November 13, the Confederate cavalry forded the Little Tennessee River at Tomotley Ford undetected  and sped through the darkness toward Maryville where they expected to find the Federal Cavalry headquarters. On the dark, rainy morning of November 14, the Confederate whirlwind blewinto the Federal camp at Maryville , scattering the members of the 11th KY Cavalry in all directions. Many escaped in the confusion, but 150 were eventually rounded up by the Confederates.
Federal cavalry headquarters was at Maryville until Brigadier General William Price Sanders decided his position was too exposed due to the "terrible number of roads leading to this place" and the Little River at his back. Sanders moved his headquarters a few miles north to the little village of Rockford , leaving only one Kentucky brigade at Maryville as anoutpost. On the morning of the 14th, Sanders and his men awoke to the distant sound of muskets and immediately rode toward the action. The Confederates, expecting their arrival, had deployed for the onslaught. The charging Federals found themselves taking withering fire from front and both flanks, forcing them to withdraw.
The Federals crossed Little River , and rallied on the north bank awaiting the Confederate troops. Wheeler failed to follow up on his success, unaware that his force of more than 4,000 horsemen greatly outnumbered Sanders' 1,500 troopers. The next morning "Fightin' Joe" Wheeler'smen advanced and crossed Little River to find the Federals prepared for their attack. Sanders' tenacious cavalrymen fought, withdrew to the next defensible position,and fought again. When the Confederates reached Stock Creek , theydiscovered the bridge partially destroyed and the creek too deep forhorses to ford. Sanders' Cavalry had taken a "strong and commanding"position on high ground on the opposite bank. Wheelerdismounted about half his force, crossed the creekand forced his way uphill under heavy rifle andartillery fire, finally forcing Sanders' withdrawal.
After repairing the bridge, Wheeler crossed his force and once again attacked the stubborn Federals who fought and withdrew only to appear on the next ridge, and the next. The rolling battle continued up to the base of the heights opposite Knoxville .
Suddenly the Confederates realized that they were no longer facing cavalry and a few pieces of fieldartillery, but infantry and entrenched artillery as well. From their commanding heights the Federals fired down on the Confederates. Since it was late in the afternoon, the contest lasted only a short time before Wheeler decided to pull his troops back and access the situation.
On the morning of November 16th the Confederates returned and once again began an exchange of shots with the Federals. However, Wheeler soon became convinced that storming the steep slopes would be too costly in both time and manpower. He pulled back his troops and crossed the Holston near the community of Louisville, joining Longstreet in his march on Knoxville.
The determined actions of Sanders' cavalry and the staunch defense of the hasty earthworks at Fort Dickerson had closed the back door to Knoxville. In the coming days the rudimentary earthworks grew, creating not only Fort Dickerson, but also Fort Higley and Fort Stanley. Knoxville's backdoor was secure.