During the Atlanta campaign, the regiment fought at the battles of Mill Creek Gap (8–11 May), Resaca (14–15 May), New Hope Church (25–28 May), Atlanta (22 July), Ezra Church (28 July), and Jonesboro (31 August). It moved into Tennessee with the army and on 30 November arrived too late to fight at the Battle of Franklin. Heavily engaged at the Battle of Nashville between 15 and 16 November, the regiment retreated with the army from Nashville to Tupelo, Mississippi. The 19th spent several months there before going to Mobile with the brigade, where it fought in the Siege of Spanish Fort between 27 March and 8 April 1865. At the beginning of the siege, the regiment mustered 152 men. After the evacuation of Mobile, the 19th Louisiana was consolidated with other Louisiana units to form the Pelican Regiment. Companies A, E, and I of the 19th became Company A of the new unit, while C, F, G, and K became D, and B, D, and H became E. This proved brief, as on 8 May the regiment surrendered at Gainesville, Alabama.