On May 1, the Union Army under Maj. Gen. U. S. Grant, composed of the 13th Corps and Logan's Division of the 17th Corps, fought the Confederate Army under Brig. Gen. John S. Bowen, composed of Tracy’s, Cockrell's, Green’s, and Baldwin's brigades, the 6th Mississippi Infantry, the Botetourt (Virginia) artillery, and a section of Hudson’s (Mississippi) battery. Most of the Confederate force arrived with thinned ranks. Tracy's brigade held the right, and Green's and the Sixth Mississippi held the left of the Confederate line. The battle opened early with the advance of Carr's and Hovey’s divisions on the Union right and Osterhaus on the Union left, with Smith's Division in reserve. About 10 a.m., the Confederate left was driven back, and Baldwin’s brigade, just arrived, formed a new line about one and one-half miles to the rear of the first position. Two newly arrived regiments of Cockrell's Brigade were posted on the new line, while Green's brigade and one newly arrived regiment of Cockrell’s brigade were ordered to the Confederate right, which had retired slightly from its first position. On arrival, the First Brigade of Logan’s division was sent to the Union left, the Third reinforced the Union right, and Smith's Division became engaged; the Second Brigade of Logan's Division did not arrive until near the close of the battle. The Confederate line held until about 5:30 p.m., when both wings were driven from their positions and fell back across Bayou Pierre, with the consolidated First and Fourth Missouri Infantry of Cockrell's Brigade arriving in time to help cover the retreat. Union casualties were 131 killed, 719 wounded, and 25 missing, for a total of 875, including one officer killed. Confederate casualties were 56 killed, 328 wounded, and 341 missing, for a total of 725, including Brig. Gen. E. D. Tracy and three other officers killed.