I came across this Yankee report of the Battle of Mansfield, April 8, 1864 in which BGen. Alfred Mouton was reported killed leading his brigade in a charge, purportedly carrying a regimental flag.

I have been unable to verify this.

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HEADQUARTERS DETACHMENT THIRTEENTH ARMY CORPS,
Pleasant Hill, La., April 7, 1864-10.20 p.m.

Colonel W. J. LANDRAM,
Commanding Fourth Division:

COLONEL: In obedience to the inclosed order you will move at 3 a.m. to-morrow, with the First Brigade of your division, and report to General Lee, 8 miles in front, at daylight or as soon thereafter as possible.

By order of Brigadier General T. E. G. Ransom:. . . .

In obedience to these orders I moved with the First Brigade of my division at the time specified, and reported to Brigadier-General Lee very soon after daylight. By order of General Lee I followed his advance beyond the creek a short distance, and was ordered to take the front and drive the enemy, with which the cavalry was then skirmishing. . . . .

. . . . . Lieutenant-Colonel Cowan, Nineteenth Kentucky, was conspicuous for the manner in which he managed his regiment, directing the fire of his men and preserving, up to the order of retreat, an unbroken line, driving the rebels from his front in three charges, and ordering the fire in which the rebel General Mounton was killed while leading a charge, carrying a regimental flag. . . . . .

W. J. LANDRAM,
Colonel Nineteenth Kentucky, Commanding Division.

Captain OSCAR MOHR,
Actg. Asst. Adjt. General, Detach. Thirteenth Army Corps.

OR V34, Pt. 1, p. 292

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Brig. Gen Alfred Mouton, USMA 1850, while commanding a division at Mansfield/Sabine Crossroads, was killed April 8, 1864. Christened Jean Jacques Alexandre Alfred.
The Civil War Dictionary, Boatner

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He was killed at the Battle of Mansfield while leading his men in a cavalry charge.

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Historian John D. Winters reports on the battle: "On his horse, Mouton made a perfect target, and a Federal marksman dropped him from his saddle.