Colonel Veatch, commanding Hurlbut's Second Brigade, formed his command at half-past seven o'clock in the morning, and was shortly after ordered to march to the support of Sherman. He reached a point not well defined, between nine and ten o'clock, and was placed in reserve. He soon became hotly engaged on McClernand's left. His two right regiments, the Fifteenth and Forty-sixth Illinois, became separated from Colonel Veatch with the other two regiments, and then separated from each other. The Forty-sixth aided the Sixth Iowa and Forty-sixth Ohio in their desperate struggle with Trabue, and after continual engagements, being forced back to within half a mile of its camp, repaired thither about two o'clock and had a comfortable dinner. The Fifteenth suffered severely. The lieutenant-colonel and the major, the only field-officers with the regiment, were killed, two captains were killed and one wounded, one lieutenant was killed and six wounded. Colonel Veatch, with the Twenty-fifth Indiana and Fourteenth Illinois, continued fighting and manoeuvring with skill and determination till the retreating division of Hurlbut passed along his rear. Colonel Veatch then reported to Hurlbut, and formed part of his line of defence in support of the reserve artillery at the close of the day. PRENTISS AND W.H.L. WALLACE. Prentiss' division in the front line, and W.H.L. Wallace's on the plateau between the river and Brier Creek, were more widely separated in camp than any other two divisions; but in the contest of Sunday they operated together. Colonel Moore, of the Twenty-first Missouri, being wounded early in the encounter with the Confederate advance, Lieutenant-Colonel Woodyard took command of the regiment, together with the accompanying detachment of the Twenty-fifth Missouri and four companies of the Sixteenth Wisconsin, sent out the night before to reinforce the pickets. Pushed by Shaver's brigade, he fell back after a struggle on the edge of a field to the farther side of a narrow ridge, about half a mile from camp, where he was joined by Colonel Peabody with the rest of the brigade. After a contest of half an hour, Shaver was repulsed and fell back. General A.S. Johnston observing men dropping out of the ranks of the retreating brigade, rallied it himself and ordered it to renew the attack. Peabody recoiled under the fresh onset, and, falling back, took his place, constituting the right of the line of battle of the division formed a quarter of a mile in advance of the camp.