Regarding Morton V. Wilson: he was listed as a private in Company C, 31st Regiment Louisiana Infantry. He enlisted in DELHI, Louisiana on 14 May 1862. He was apparently present for duty through February 1863, the last extant muster roll for this regiment. He was captured at Vicksburg and paroled on 10 July 1863. His service record has no further information. He may have returned to service the next summer, in June 1864, when the regiment reformed at Minden and then later at Pineville, as there are no complete rolls for this regiment after the surrender at Vicksburg.
Here is an outline of some information on the 31st (this information comes from Dr. Arthur W. Bergeron's work "Guide to Louisiana Confederate Military Units" with some of my own research added):
The 31st Regiment Louisiana Volunteers was one of the last to form from Louisiana. It consisted of companies raised primarily in north Louisiana, including the parishes of Carroll, Caldwell, Catahoula, Claiborne, and Union. It was formed on 11 June 1862 from Morrison's Battalion, which had formed the previous month, on May 14th. Due to the loss of New Orleans, Louisiana's Confederate training camp, Camp Moore in Tangipahoa Parish, was in danger of falling into Yankee hands. The 31st could not get to Vicksburg since the land east of Monroe was flooded that spring. Instead, Morrison’s Battalion trained in Monroe in May and June, but then moved to a camp in the swamp eight miles west of Vicksburg in Madison Parish. A soldier reported that this camp “…was the most disagreeable place men were ever compelled to stop in.” Measles and “fever” were rampant among the troops during this period. Some time later, the regiment was ordered to Tallulah, and then some soldiers in the regiment were ordered to New Carthage on the Mississippi for clothing and blankets for General Pike’s Indian brigade. Soon afterwards, in August, about sixty-five soldiers from the 31st Regiment were ordered to Milliken’s Bend to help unload a shipment of arms on the steamer “Fair Play”, again for General Albert Pike’s brigade; at this time these men were mostly without arms and many were sick. They camped the night before unloading was to begin, but they were surprised by a Yankee gunboat while sleeping. Panic ensued, the soldiers of the 31st Regiment fled, and the Yankees captured the “Fair Play” with all the arms still onboard. After evading the Yankee pursuers, the men regrouped in Tallulah. The regiment camped there until October, when they moved to a camp near Delhi. Near the end of October, the regiment moved to the “pine hills” west of Trenton (now West Monroe), and remained there until November, when they were ordered to Jackson, Mississippi.
After remaining in Jackson for two weeks, a portion of the regiment was ordered northward to intercept some Federals out on a raid from Memphis. They traveled as far north as Water Valley (just south of Oxford), but encountered no Yankees. The regiment was then ordered to Vicksburg, where they remained for two or three weeks. One night in late November they received orders to cook two days rations and be ready to move by 3 a.m. They traveled back to Jackson in box cars on a rainy day, one company crowded into a single car. This forced the men to stand the entire trip, and as the cars leaked badly, they were soaked. As soon as they arrived in Jackson, they were ordered back to Vicksburg, arriving at 3 a.m. the next morning; this made twenty-four hours on their feet in wet clothing. Within ten days, 40 soldiers of the 31st Regiment had died of pneumonia and meningitis. Between December 26-29, they participated in the Battle of Chickasaw Bayou, resulting in the defeat of the Federal army under General William T. Sherman. Their trenches were bombarded by the Yankee cannons first, with several soldiers losing their lives. One soldier wrote that “…they fired on us for three days and a half. We repulsed them in every charge they made on our earth works with heavy loss. The 31st fought from 2 to 4000 men and come out with a loss of 9 killed and 16 wounded so you see we come out remarkably well…” The regiment drilled and performed picket duty in Vicksburg until late April, when the Federals slipped past the Vicksburg defenses and landed near Port Gibson. They saw active service in the closing stages of the Battle of Port Gibson on May 1; several soldiers were captured during that engagement, besides others killed and wounded. The regiment retreated back to Vicksburg, and then were ordered to the Big Black River for picket and guard duty while the bulk of the Confederate army retreated across the river and into the Vicksburg defenses. The 31st Regiment fell in behind them and came into the city as the army’s rear guard on May 17 or 18. They fought in the trenches during the Siege of Vicksburg between May 19 and July 4; in particular, they helped to repulse the strong Federal assault on May 19th. Lt. Col. Sidney H. Griffin died in the trenches on June 27th. The regiment was paroled to their homes after the surrender of Vicksburg, and remained there until January. Some soldiers went to a parole camp near Vienna in January 1864, but then returned home on furlough after a few weeks since the exchange had been delayed. They were officially exchanged in June, and went into camp near Minden, where they remained until June 14, when they moved to Shreveport. After a short stay, they moved to Alexandria and then went into camp at Pineville, where they remained until February 1865. During this period, the regiment was assigned to General Allen Thomas’ brigade and acted as a support for Fort Buhlow and Fort Randolph near Pineville. In February the regiment moved up the Red River to Bayou Cotile, where they remained until Lee’s surrender in April. They moved to Natchitoches until May, when they marched towards Mansfield. Along the way, they were disbanded just prior to the surrender of the Trans-Mississippi Department.