17th Illinois

On back of monument:
17th Infantry,
Commanded by
1. Lieut. Col. Enos P. Wood.
2. Major Francis M. Smith.
This regiment formed the right of the Third Brigade, 1st Division, and went into battle on this line about 8.30 a.m., April 6, 1862, holding it until 10 a.m., when it fell back about 60 yards. The regiment lost in the battle 5 officers and 113 men wounded; 15 men killed; 5 missing; total, 138.

29th Illinois

On back of monument:
29th Infantry,
Commanded by Lieut. Col. Chas. M. Ferrell.
Went into battle on this line at 8.30 a.m., April 6, 1862, and held it until 10.00 a.m., then retreated to a position north of Corinth road facing Purdy road. It lost in the battle 3 officers and 9 men killed; 2 officers and 71 men wounded; 4 men missing; total, 89.

43rd Illinois

On back of monument:
43d Infantry,
Commanded by Lieut. Col. A. Englemann.
This regiment formed on its color line on the morning of April 6, 1862, and moved forward to a position supporting Waterhouse's Battery, which was held until 10:00 a.m., when it fell back to this point and formed a line with the rest of the brigade. Its loss in the battle was 5 officers and 45 men killed; 7 officers and 111 men wounded; 29 men missing; total, 197.

49th Illinois

On back of monument:
49th Infantry,
Commanded by Lieut. Col. Phineas Pease, Wounded.
This regiment fell in for battle on its color line about 8.30 a.m., April 6, 1862, and held it but a short time when it moved back fighting to this place. Its loss in the battle was 2 officers and 17 men killed; 4 officers and 79 men wounded; 8 men missing; total, 110.

11th Illinois

On back of monument:
11th Infantry,
Commanded by
1. Lieut. Col. T. E. G. Ransom, Wounded.
2. Major Garrett Nevins, Wounded.
3. Capt. L. D. Waddell.
Went into battle on this line with 9 companies (one company on picket) about 9.00 a.m., April 6, 1862, receiving a fire that killed or wounded, in a few minutes, the Lieut. Colonel, Major, four line officers and many men. This position was held about two hours when they fell back 500 yards. The regiment lost in the battle 1 officer and 16 men killed; 4 officers and 65 men wounded; 17 men missing; total, 103.

Note:

I would have included a picture of the headquarters monument for Marsh but none exists. You can read his official report here. Interestingly he signed it "March" but it appears on monuments as "Marsh."

20th Illinois

On back of monument:
20th Infantry,
Commanded by
1. Lieut. Col. E. Richards, Wounded.
2. Major F. A. Bartleson, Wounded.
3. Capt. O. Frisbie.
Went into position here about 9.00 a.m., April 6, 1862, and held it until 11 a.m., when it withdrew, going to the rear of its own camp where it formed a new line. The regiment lost in the battle 1 officer and 21 men killed; 5 officers and 102 men wounded; 7 men missing; total, 136.

45th Illinois

On back of monument:
45th Infantry,
Commanded by Col. John E. Smith.
Went into battle on this line about 9.00 a.m., April 6, 1862, and maintained this position until 11.00 a.m., when it joined the division on a new line. The regiment lost 1 officer and 22 men killed; 17 officers and 170 men wounded; 3 men missing; total, 213.

48th Illinois

On back of monument:
48th Infantry,
Commanded by
1. Col. I. N. Haynie, Wounded.
2. Lieut. Col. W. W. Sanford, Wounded.
3. Major M. Mayfield.
Went into line of battle here about 9.00 a.m., April 6, 1862, and held it until 10.50 a.m., when it was driven back 500 yards. The regiment lost in the battle 1 officer and 17 men killed; 4 officers and 108 men wounded; 1 officer and 2 men missing; total, 133.

11th Iowa

On back of monument:
Iowa
11th Regiment Infantry Volunteers,
Commanded by Lieut. Col. WM. Hall, (Wounded)
This regiment, detached from its brigade, was placed in position here by order of General McClernand about 9.30 a.m., April 6, 1862. It was at once strongly attacked by the enemy, suffering here its most severe loss. It held this position until 11 a.m. when it retired to its second position 100 yards in front of its camp in Jones field. It had present for duty 763. Its loss was, 1 officer and 32 men killed; 5 officers and 155 men wounded; 1 man missing; total, 194.

13th Iowa

On back of monument:
Iowa
13th Regiment Infantry Volunteers,
Commanded by Col. Marcellus M. Crocker.
This regiment held this position from 9 a.m. to 11 a.m., April 6, 1862. Retired under orders about two hundred yards, and maintained its position until about 2.30 p.m. Moved to a point near the camp of 15th Illinois Infantry where it repelled a charge of Wharton's Cavalry. Under orders, moved to a point near, and west of, camp of 3d Iowa Infantry, where it fought its severest engagement, and remained until about 4.30 p.m., when both flanks being turned, it fell back, by order, to the Corinth road and joined a portion of Colonel Tuttle's command; advanced toward the enemy; then retired to the last line of the day, its right in front of the camp of the 14th Iowa. Was in reserve line on the 7th with slight loss. Present for duty, including officers, musicians, teamsters, etc., 760. Its loss was, 1 officer and 23 men killed; 1 officer and 15 men mortally wounded; 8 officers and 118 men wounded; 5 men missing; total, 171.

18th Illinois

On back of monument:
18th Infantry,
Commanded by
1. Major S. Eeaton Wounded.
2. Capt. D. H. Brush, Wounded.
3. Capt. Wm. J. Dillon, Killed.
4. Capt. J. J. Anderson.
This regiment returned the fire of the enemy while marching by the flank to take this position in line of battle. It held this line from about 9.30 to 11.00 a.m., April 6, 1862, when it retired, skirmishing, about one-fourth of a mile. Its loss in the battle was 1 officer and 16 men killed; 7 officers and 61 men wounded; 2 men missing; total, 87.

8th Illinois

On back of monument:
8th Infantry,
Commanded by
1. Capt. J. M. Ashmore, Wounded.
2. Capt. W. H. Harvey, Killed.
3. Capt. R. H. Sturgess.
This line was held from 9.30 a.m. until 11.00 a.m. April 6, 1862, when the regiment was forced back to a position behind Duncan field. It lost in the battle, 1 officer and 29 men killed; 1 officer and 90 men wounded; 3 men missing; total, 124.