The 14th Confederate Cavalry was organized on 14 September 1863 by the consolidation of Garland's Mississippi Cavalry Battalion (three companies became A, B, and C in the 14th), Rhodes' Mississippi Partisan Rangers Company, the Cavalry Battalion of Miles' Louisiana Legion (three companies became E, D, and G in the 14th), and Mullen's Louisiana Scouts and Sharpshooters Company (became Co. H of the 14th). However, Co. A of Miles' Louisiana Legion refused to recognize its assignment to the new regiment as Co. E and maintained its independence; in fact, all the companies from Miles Legion tended to act separately from the rest of the new regiment."

Co. "I" was organized on 25 November 1863, and Co. "K" was organized on 22 January 1864. The regiment disbanded in early 1865. The four Louisiana companies (Cos. "D", "E", "G" and "H") became Cos. "A", "I", "C", and "E" respectively of Ogden's Louisiana Cavalry Regiment. The six Mississippi companies (Cos. "A", "B", "C", "F", "I", and "K") were consolidated into two companies and assigned as Cos. "C" and "H", of the 3rd, 14th Confederate and 28th Mississippi Cavalry Regiment, Consolidated. It served in William W. Adams', John S. Scott's, Hinchie P. Mabry's, then returned to Adams' Brigade in the Department of Alabama, Mississippi, and East Louisiana. The regiment fought in the Meridian Campaign (February-March 1864), in A. J. Smith's 1st Mississippi Invasion (July 1864), and they fought at Tupelo (July 1864). Unit commanders were Col. Felix Dumonteil, Lt. Cols. John B. Cage and William H. Garland, and Major Pinkney C. Harrington.

"T. C. Rhodes' Cavalry Company" was reported on duty in Louisiana during the Baton Rouge campaign, attached to Garland's Battalion; detached before April 7, 1863. Capt. T. C. Rhodes, with about thirty men, was commandant of post at Osyka, time of Grierson’s raid, April-May, 1863.

Major W. H. Garland's Battalion of Cavalry is mentioned in the official reports as on duty at Ponchatoula, La., October, 1862. January, 1863, General Gardner assigned Major Garland, with his battalion and Rhodes' company, to guard the approaches from Baton Rouge. They were stationed in front of Tangipahoa. They were sent to the assistance of Colonel H. H. Miller at Ponchatoula, in March, 1863, and had skirmish with enemy at Servich's Ferry, Amite River, which was creditable and successful. The battalion had three companies (Rhodes detached).

General Grierson, in reporting his raid through Mississippi, 1863, said that he encountered Garland's Cavalry at Edward's bridge over the Tickfaw, April 30. Garland reported, May 1, that he had lost about 70 men and his horses were all broken down.

During the siege of Port Hudson Garland's Battalion was with the command of Col. John L. Logan, headquarters Clinton, La., operating in the Federal rear. August 3, near Jackson, La., Logan defeated a detachment from Port Hudson, mainly "Corps d'Afrique," capturing nearly a hundred prisoners and a battery of two Parrot guns.

In August, 1863, Col. John L. Logan, headquarters at Georgetown, Miss., covering Port Hudson and Natchez, had under his command the Mississippi Battalions of Cage, Garland, Hughes and Stockdale and Rhodes' Company, with Roberts’' Battery and an Arkansas Regiment and Tennessee Battalion. Gen. S. D. Lee was instructed to transfer the command to another point, and investigate "the report that after the recent action near Jackson, La., 23 prisoners (1 white officer and 22 colored and Negro privates) were put to death in cold blood and without form of law," also to organize Colonel Dumonteil’s Regiment if convenient. In September the command, with organizations the same, had headquarters at Crystal Springs.

Cage's Cavalry Company was on duty about Port Hudson in spring of 1863. May 6, ordered to proceed to Clinton, La., on the move to Jackson, Miss., and report to Gen. Frank Gardner.

Colonel Dumonteil and "his command" were in the field with the brigade under Col. John L. Logan, with the cavalry under Gen. W. H. Jackson, during the advance of General McPherson from Vicksburg to Canton, in October, 1863, and are mentioned in the report of the skirmishing near Bolton, October 18. Gen. Wirt Adams was in command of Logan's troops in December. The Fourteenth Confederate Regiment was with Adams at Ellis Cliffs, December 6, 1863, and after the skirmish with the Federal command from Natchez that followed, the Fourteenth and Stockdale's Battalion made the pursuit for several miles.

The regiment was listed under Capt. Josephus R. Quin, in Adams' Brigade of W. H. Jackson's Division, in the organization under Maj.-Gen. S. D. Lee, January, 1864; was with Adams' Brigade and Gen. S. D. Lee in the battle near Champion's hill, February 4-5, 1864, against McPherson's column of Sherman's army, marching to Meridian. Colonel Dumonteil and his regiment skirmished for several hours with Winslow's Cavalry on the 4th, on the Raymond road. They were held in reserve and took turn in covering the retreat at Baker's Creek, next day. After this they were in constant service during the campaign, moving to Meridian, Starkville, Canton and back to the Big Black. At Decatur, on the march to Meridian, "Wood's and Dumonteil's Regiments made a dash at a wagon train and succeeding in killing a number of men and mules, but were compelled to abandon the wagons captured, as enemy had force of infantry in front and rear of train." (W. H. Jackson).

The regiment was employed in April, 1864, in the campaign against deserters and insurgents on Honey Island and beyond Monticello. Companies of Gonzales and Mills detached with Colonel Scott in same operations. June, 1864, Company D, Capt, Joseph Gonzales, and Company H, Capt. L. S. Greelee, with Scott's Brigade. June 10, Fourteenth Confederate Regiment, Col. F. Dumonteil, Mabry's Brigade, Adams' Cavalry.

Col. Hinchie P. Mabry's Brigade, Fourth, Sixth and Thirty-eighth Mississippi, and Fourteenth Confederate (in all about 1,000) moved from Saltillo to join Buford's Division, Forrest's Cavalry. July 9, moved in advance of the approaching Federal command, under Gen. A. J. Smith, and on the 12th the Fourteenth, Lieut.-Col. Cage commanding, skirmished with the enemy's advance, near Pontotoc. The brigade skirmished through the next day with the rear guard of Smith's column, moving toward Tupelo. At Harrisburg Smith faced about across the road in a strong position and Generals S. D. Lee and Forrest attacked. Mabry's Brigade was distinguished in the assault, on the left flank, through the corn field, closely approaching the Federal line on the ridge, but with the rest of the force was repulsed with heavy loss. Among the killed were Lieut.Col. John G. Cage (mortally wounded), Capt. J. R. Quin and Lieut. C. A. Gatlin. The total casualties of the regiment were 10 killed, 61 wounded, 1 missing. "On the morning of the 15th," Colonel Mabry reported, "the Fourteenth Confederate Cavalry occupied the front, skirmishing with the enemy." General Lee wrote of the battle that "he was on many battlefields during the four years, but he never saw greater gallantry or tenacity of purpose shown than was shown by the troops of the brigades of Rucker, Mabry, Bell and Crossland, and the batteries of Rice, Morton and Thrall. He will always esteem it an honor to have personally commanded such heroes."

Mabry's Brigade was in the field again during Grierson's raid across the State in December, 1864. March 3, 1865, Mabry's Brigade was broken up and the Fourteenth assigned to Gen. Wirt Adams' Brigade. The last service was in Alabama during Wilson's raid. Selma was carried by assault April 2, the department was surrendered by General Taylor May 4, and General Forrest surrendered his cavalry May 22.