Harris's Battery accompanied Sterling Price during his raid into Missouri in late 1864, during which it fought at the battles of Pilot Knob, Glasgow, Little Blue River, Big Blue River, and Mine Creek, as well as several smaller skirmishes.

[1] [a] After the reorganization, the battery served in the brigade of Brigadier General John S. Marmaduke and was armed with four 6-pounder smoothbore cannons.

[3] At Poison Spring, Harris's Battery was part of the brigade of Colonel Colton Greene.

[5][6] On April 29, the battery accompanied Greene's brigade as it harassed Steele's retreating column, and saw some fighting.

During June 1864, the battery operated against Union Navy vessels serving on the Mississippi River and inflicted damage on several gunboats and transports.

[3] On June 6, the battery was present at the Battle of Ditch Bayou, where it guarded Lake Village, Arkansas.

[12] On October 25, at the Battle of Mine Creek, Harris's Battery was positioned near the center of the Confederate line.

[12] After the end of Price's Raid, the battery was transferred to Grand Ecore, Louisiana, where it was used to operate heavy artillery guarding the Red River.