Greg, I'm not thoroughly familiar with the Union side of things at Helena, except to say that detachments of the 43rd Indiana, 33rd Iowa and 33rd Missouri all seem to have been involved in the capture of the forward elements of the 37th Arkansas. Here is what Lieutenant-Colonel William H. Heath, commanding 33rd Missouri, reported:

About 9 a.m. a second attack was made upon Battery D by Fagan’s brigade of Arkansas troops, three regiments strong, and said by prisoners to have acted under the personal direction of Lieutenant-General Holmes. The battery was bravely supported by detachments from the Forty.third Indiana, under Major Norris, and the Thirty-third Iowa, under Major Gibson. In spite, however, of the most determined resistance, Bell’s regiment, with small portions of Hawthorn's and Brooks’, succeeded in penetrating our outer line of rifle-pits, and securing a position in a deep ravine to the left of the battery and below the range of its guns. The remainder of the brigade was broken and scattered by the terrific fire of our artillery in the works, and compelled to seek shelter in the woods out of range.

Immediately upon their retreating, our riflemen from all three regiments in the pits closed in upon those of the enemy who were in the ravine, from all sides cutting off retreat. The reserve of the Forty-third Indiana formed across the mouth of the ravine, and two Parrott guns of the First Missouri Battery, under Lieutenant O’Connell, were also brought to rake the enemy’s position. Capt. John G. Hudson, of the Thirty-third Missouri, commanding Battery D, then demanded the surrender of the entire force. The men at once threw down their arms, and Lieutenant-Colonel Johnson, of Bell’s regiment, made a formal surrender of his command, mustering 21 officers and between 300 and 400 men, with all their arms and one stand of colors. At about 10.30 a.m. the main body of the enemy had entirely drawn off from in front of our batteries and the firing ceased.

Capt. John G. Hudson, mentioned above, wrote:

I fired my first gun at 4.25 a.m., and ceased at 10 a.m. My men behaved finely. I was supported by a battalion of the Forty-third Indiana Volunteers and two companies of the Thirty-third Iowa Volunteers.

Lieutenant-Colonel Cyrus H. Mackey, commanding 33rd Iowa, reported:

At 8 a.m. they charged Batteries D and C, bringing forward Generals Fagan’s and Parsons’ brigades. They succeeded in carrying Battery C, but not until they had many of their men and officers killed and wounded; but their superiority in numbers was so great that they completely overpowered our force at the battery. The three companies from my own regiment and two from the Thirty-third Missouri constituted the entire force at this battery. The men retired from the battery in the direction of Fort Curtis, about 250 yards. By this time we had completely routed the enemy in front of Battery D. They succeeded here only sufficiently to get possession of the extreme left of the rifle-pits. Our force at this battery consisted of six companies of my own regiment, six of the Thirty-third Missouri, and two of the Forty-third Indiana. I now withdrew Companies I and K, and formed a new line with them, and Companies A, F, D, and C, to the rear of Battery C 250 yards, which succeeded completely in stopping any further progress of the enemy. Finding themselves repulsed at all points, they commenced to fall back to the timber. Things at this battery remained in this condition for some time. Many of them, instead of falling back to the timber, took refuge in the woods around the battery, and kept up a desultory fire therefrom. Finding that the enemy was not going to attempt anything more in this direction, I withdrew the two companies I had brought here, and returned to the Little Rock road, in front of Battery D; arriving there I ordered the whole force to charge forward on this road. The entire force advanced with a will that carried everything before them, and in ten minutes I had complete possession of the entire battle-ground on this road and obtained several hundred prisoners and two stand of colors.

Col. Samuel A. Rice, 33rd Iowa, commanding the brigade to which these regiments belonged, didn't dredit any specific regiment with the capture of the 37th Arkansas, but of course the captured colors were credited to his own regiment.

Based on these reports, it seems to me that the 33rd Missouri should have been credited with the actual capture of the force under Colonel Bell, supported by the 43rd Indiana and 33rd Iowa. I wish an expert on this battle would pitch in and work this confusion out.