[4] The 72nd drove the enemy before it along the seven mile length of the gap until they were halted by four brigades of infantry and four batteries of guns at the southeastern exit.

The massive superiority of firepower the 17th and its brethren had with the Spencers allowed them to entrench and hold the southern entrance against numerous assaults by numerically superior rebel infantry and artillery through the rainy day until the sodden remainder of the XIV Corps slogged to join them at their position.

After playing a key role in the feint that forced Bragg from Chattanooga, the regiment raided, skirmished, and scouted through the summer into the Chickamauga Campaign.

During the reorganization after Grant took command in the city, the brigade was broken up and the regiments were transferred to the Cavalry Corps.

In positions at Terrapin Creek in Cherokee County, northern Alabama, the 72nd was dismounted on 1 November.