I believe you will find the information you desire below.
Good Hunting,
George Martin
Sparks, NV
3rd Regiment, Louisiana Cavalry (Harrison's)
3rd (Harrison's) Cavalry Regiment was organized during the winter of 1863-1864 with men from the southwestern section of the state. For a time it served behind Federal lines, then was attached to the Trans-Mississippi Department. This unit was active within the boundaries of Louisiana and saw action in the operations against Banks' Red River Campaign. Later it skirmished in various conflicts and disbanded in May, 1865. Colonel Isaac F. Harrison was in command
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From the Official Records of the War of Rebellion
Organization of the Army of the Trans. Mississippi Department, General E. Kirby Smith, C. S. Army, commanding, September 30, 1864.
INDEPENDENT CAVALRY BRIGADES.
Vincent''s Brigade.
Col. WILLIAM G. VINCENT.
2d Louisiana, Col. James D. Blair.
6th Louisiana, Col. William Harrison.
7th Louisiana, Col. Louis Bush.
1st Louisiana Battalion, Lieut. Col. B. W. Clark.
2d Louisiana Battalion,(*) Lieut. Col. H. M. Fayrot.
Harrison's Brigade.
Col. ISAAC F. HARRISON.
3d Louisiana, Col. Isaac F. Harrison.
4th Louisiana, Col. A. J. McNeill.
5th Louisiana, Col. Richard L. Capers.
.
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U. S. S. VINDICATOR,
Natchez, September 14, 1864.
Maj. Gen. E. R. S. CANBY,
Comdg. Mil. Div. of West Mississippi, New Orleans:
GENERAL: One of the gun-boats of this division, the Rattler, was so unfortunate as to have 18 of her crew captured by a portion of Harrison's cavalry some nights since. The commander landed his men in disobedience of orders and fell into an ambuscade laid for him by the rebels. The men were paroled, and are now on board the Rattler. Bather than send them to Cairo, I would like very much to exchange them. General Brayman tells me he is constantly picking up prisoners, and with your permission he would turn over to me a sufficient number to effect the exchange. If this is agreeable to your wishes, upon hearing from you, I will communicate with Colonel Harrison and endeavor to effect this specific exchange.
Very respectfully, your obedient servant,
THOS. O. SELFRIDGE,
Lieut. Commander, Comdg. Fifth Div., Mississippi Squadron.
OR V. 41, Pt. 3, p. 182
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HDQRS. MILITARY DIVISION OF WEST MISSISSIPPI,
OFFICE OF THE CHIEF SIGNAL OFFICER,
New Orleans, September 30, 1864.
Maj. Gen. E. R. S. CANBY,
Comdg. Mil. Div. of West Miss., New Orleans, La.:
GENERAL: I have the honor to submit to your consideration a statement of the information received at this office this 30th day of September, 1864, from the following sources: A report from Bernard Norton, scout, mouth of White River, September 24; the statement of W. W. Aber, Vicksburg, Miss., September 20; the statement of W. T. Jordan, Vicksburg, Miss., September 22. Mr. Norton states that General Price crossed the Arkansas on the 7th instant, at Dardanelle and Galls Rock, with 8,000 men, 12 guns, and 400 wagons. He is moving in the direction of Missouri. North of White River, at Jacksonport, Generals McCray and Shelby are moving in the same direction, with a force estimated at 6,000 cavalry. There is no force at Hot Springs. Colonel Logan is at Princeton, with 600 cavalry. Captain Cooper is at the North Fork of the Saline, with three companies of cavalry. Colonel Harrison's command, the Third Louisiana Cavalry, his own regiment, Colonel Capers' regiment, and Colonel McNeill's regiment., were at Oak Ridge, La., on the 13th instant, but were under orders to move into Arkansas to re-enforce Marmaduke, or to do picket duty near Monticello while the other troops move into Missouri. His force is estimated from 1,500 to 2,500. On the 13th Walker's and Polignac's divisions were still at Monroe, La., but under marching orders for the north. Price's army of invasion is said to be 20,000 or 25,000 strong. Captain Lee's guerrillas, seventy-five or eighty strong, on the 14th instant, were at Bone Wade's plantation, four miles above Floyd, La.
I am, general, very respectfully, your obedient servant,
FRANK W. MARSTON,
Major, Signal Corps, U.S. Army, Commanding
OR V41, Pt. 3, p. 497/8
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NE BLUFF, ARK., October 16, 1864.
Major-General STEELE:
Lieutenant Grove has returned from the four days' scout. He made the round I designated. Harrison's cavalry brigade is at Monticello. Parsons' cavalry division has been ordered back to Monticello. He did not hear anything from Magruder. After he crossed Bayou Bartholomew on the South Bend road about 200 cavalry got after him and pressed him pretty hard, but he managed by crossing the bayou twice to elude them. I look for Colonel Erskine back to-night or to-morrow morning. Colonel Sackett started back at 1 p.m. to-day on Annie Jacobs.
POWELL CLAYTON,
Brigadier-General, Commanding.
OR V41, Pt. 4, p. 6