It's in the Official Records, Series I, Vol. XXVI/1, pp. 248-49:

AUGUST 20-SEPTEMBER 2, 1863.--Expedition from Vicksburg, Miss., to Monroe, La., including skirmishes (24th) at Bayou Macon and at Floyd.

Report of Brig. Gen. John D. Stevenson, U.S. Army, commanding Expedition.

HDQRS. THIRD DIVISION, SEVENTEENTH ARMY CORPS,
Vicksburg, Miss., September 3, 1863.

GENERAL: In pursuance of your written instructions of date August 20, 1863, I assumed command of the expedition designated by you as the Louisiana Expedition, consisting of the Third Division, Seventeenth Army Corps; Third Brigade, Sixth Division, Seventeenth Army Corps; Bolton's and Sparrestrom's batteries; the howitzer section of the Eighth Michigan Battery, and Major Osband's battalion of cavalry.

On the 20th of August, the entire command was embarked on steam-boats, and transported to Goodrich's Landing, Carroll Parish, La., where it was debarked on the morning of the 21st of August. Resting until 4 a.m. of the 22d, we commenced the march in direction of Monroe, La. Pushing the command forward with all rapidity, we arrived at Monroe on the 27th instant. In the course of the march we first encountered the pickets of the enemy on the Bayou Tensas, they retiring before our cavalry advance. At Bayou Macon, some show of a stand was made, but, being soon driven from their position by the command of Major Osband, the ford of the bayou was taken possession of, and held until the advance of the infantry column reached the ford. I then directed Major Osband to push forward with his command to the town of Floyd, which he did with great promptness with a part of his command. Finding the pace occupied by rebel cavalry, he charged into the town, and, after a sharp skirmish, drove the enemy from the place, with the loss to them of a number of prisoners, and to his command of 1 enlisted man severely wounded. In the meantime, a portion of his command, being detached for that purpose, surprised the camp of a company of rebel cavalry south of the ford, destroying the camp, capturing 7 prisoners, the tents, and transportation of the force. The march from Floyd to Monroe was uninterrupted, with the exception of frequent feints of defense on the part of the enemy, they invariably fleeing on the approach of the command. The military results of the expedition were the breaking up of the several camps at Floyd, Delhi, Monticello, Oak Ridge, and Monroe, and the precipitate flight of the enemy beyond the Washita River, in the direction of Shreveport. From the best information of the force of the enemy, when aggregated, the whole being under the command of Brig. Gen. P. O. Hébert, I estimate their nominal strength at 4,000 men, all cavalry, with two pieces of artillery. I do not think the effective force exceeded 1,000, many of the men being unfit for duty on account of sickness. At Oak Ridge, and also at Monroe, we found a number of hospitals established, all of them crowded with sick. In the town of Monroe, the enemy abandoned a small amount of commissary stores and forage. I found the inhabitants well disposed, and many expressions of satisfaction at the occupancy of the place by the Federal Army. The evidences of residuary loyalty were marked, and, in my judgment, only require the certainty of the establishment of Federal authority to assume the form of open declaration of attachment to the Federal Government, with demonstrative acts of loyalty for its maintenance.

I found two small earthworks thrown up by the enemy on the west bank of the Washita, immediately opposite the town; they were not occupied. Three miles west of these works about 5,000 bales of Confederate cotton had been collected and stored. This the enemy burned as they retired. I found the country in a high state of cultivation, with immense crops of corn and cotton maturing, and vast numbers of cattle fattening in the cane-brakes and swamps. I have no doubt but that forage and beef could be secured from this country in sufficient quantities to supply the department for the ensuing winter. The cotton crops of the past two years are ginned and baled on the plantations. So far as I could learn, no cotton has been burned west of Bayou Macon. I think I do not overestimate the cotton in this region that could be taken possession of by the Government in fixing the amount at 50,000 bales.

The railroad, known as the Vicksburg and. Shreveport Railroad, is not operated beyond Monroe. The rolling-stock is limited--five engines and about fifty freight and two or three passenger cars. The road is in running order to Delhi. Some small portion of the machinery of each engine was removed, to prevent the use of the road, but could easily be supplied. I did not consider the destruction of road or rolling stock a military necessity, it being of no value for military purposes to the enemy. I therefore left them undisturbed.

I remained at Monroe one day and night, and, having fully accomplished the objects of the expedition, as expressed in your letter of instruction, commenced my return march on the 28th ultimo, reaching the Mississippi River on the morning of the 2d instant. Embarking the entire command on boats provided for that purpose, have returned the entire command to their respective commands at this post. The distance accomplished by the command was 152 miles marching, and about the same distance on boats. The endurance and spirit of the command during the entire expedition were of the highest order. It affords me much pleasure to bring to your special notice the fact that the march throughout the entire distance was marked by comparatively no acts of vandalism or plunder, the whole command treating all the inhabitants with the utmost forbearance and consideration, giving them no cause of complaint. To all the officers of the command I am indebted for the promptness and efficiency with which they discharged their several duties, and to it attribute the success of the expedition.

Respectfully,

JOHN D. STEVENSON, Brigadier-General, Commanding.

Maj. Gen. J. B. McPHERSON, Commanding, Seventeenth Army Corps.