At the Battle of Iuka on September 19, the battery was assigned to Hébert's brigade of Brigadier General Lewis Henry Little's division, which was part of Major General Sterling Price's Army of the West. The battery came under enemy fire at Iuka, suffering one casualty, although it did not have the opportunity to fire its cannons. At the Second Battle of Corinth on October 3 and 4, the battery was in the brigade of Colonel W. Bruce Colbert; Hébert had been elevated to division command to replace Little, who had been killed at Iuka. A portion of the battery saw light duty at Corinth. On October 5, the battery was engaged at the Battle of Davis Bridge, fending off a Union pursuit as the Confederates retreated from Corinth. The 3rd Missouri Light Battery was positioned in the middle of the Confederate line and attracted heavy Union artillery fire. The battery fired in response, but eventually ran out of ammunition. When a Union infantry charge broke the Confederate line, the battery was unable to withdraw some of their pieces, losing either three or one cannon to capture. After Davis Bridge, the battery was transferred to Holly Springs, Mississippi and then Grenada, Mississippi.