Major General Ambrose Burnside, commander of the Department and Army of the Ohio, began to advance againstKnoxville, Tennessee. Burnside left Cincinnati, Ohio in mid-August 1863. The direct route ran through the Confederate-held Cumberland Gap. Burnside had been delayed in earlier attempts to move out against Knoxville and thus chose not to spend the time to force a passage of the gap. Instead he detached one brigade under Colonel John F. DeCourcy to pose a threat to Brigadier General John W. Frazer's 2,300 man garrison, while the rest of the army bypassed to the south over 40 miles in rugged mountainous terrain.DeCourcy had previously led a brigade in the 1862 operations against the Cumberland Gapunder George W. Morgan.
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Despite this, Burnside made a rapid advance on Knoxville. Many of the Confederates in eastern Tennessee had been withdrawn for the upcoming Battle of Chickamauga, leaving only two brigades under General Sam Jones (including Frazer's). Having successfully occupied Knoxville on September 2, Burnside could now return his attention to the Cumberland Gap.
Frazer and his 2,300-man garrison had little combat experience, yet they had the benefit of a strong natural defense. Frazer's men supplemented this by digging their own trenches. General Simon B. Buckner had given Frazer orders to hold the gap at all cost, yet when Buckner and all his troops were redeployed, no contingency had been formulated for retreat and therefore Frazer continued following his orders from Buckner to hold the gap. DeCourcy's brigade threatened the Confederates from the north, but his brigade alone was not enough to force Frazer out of the gap. Burnside dispatched a second brigade under Brigadier General James M. Shackelford. Shackelford approached from the south and, on September 7, asked for Frazer's surrender. There were still not enough Union troops to convince Frazer to surrender. Burnside personally left Knoxville with a brigade under Colonel Samuel A. Gilbert and marched 60 miles in just over a day.]On September 8 both DeCourcy and Shackelford sent messages demanding surrender, all of which were rejected.Around 10:00 a.m. on September 9, Burnside sent a message to Frazer stating he now had a large enough force to carry the gap by storm. The large Union force, little combat experience and low morale (after news of Vicksburg and Gettysburg) all factored into Frazer's decision to surrender. Around 3:00 p.m. Frazer agreed to an unconditional surrender of all the Confederates guarding the Cumberland Gap. Between 100-300 men managed to escape through DeCourcy's lines after the surrender had taken place, but the rest of the soldiers, arms, 14 pieces of artillery and the strategic location were now in Union control. This was the last major operation against the Cumberland Gap and it would remain in Union hands for the rest of the war
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