Official Site: The Battle of Raymond, Mississippi (May 12, 1863)

A brief history from "A Guide to the Campaign & Siege of Vicksburg"
Following the Union victory at Grand Gulf and Port Gibson, Grant moved his army in a northeasterly direction toward Raymond, using the Big Black River to protect Major General John A. McClernand's corps on the Union left. Major General William T. Sherman was in the center and Major General James B. McPherson on the right. Grant planned to strike the Southern Railroad of Mississippi between Vicksburg and Jackson and isolate Vicksburg by cutting Lieutenant General John C. Pemberton's supply and communications line.
General McPherson's XVII Corps was marching along the Utica Road southeast of Raymond in the valley of Fourteen-mile Creek when about 10:00 a.m. its skirmish line was suddenly hit by the deadly fire of Brigadier General John Gregg's battle-hardened Confederate brigade. The three guns of Captain Hiram Bledsoe's Missouri battery, positioned to cover the bridge across the creek, also opened fire on the Federals at a range of 1,000 yards.

Gregg had thought his 4,000 men could turn the Federal right flank. Faulty intelligence informed him he was facing a small force. When the 50th Tennessee Infantry crossed Fourteen-mile Creek, they realized instead that McPherson had 12,000 men before them. While thick clouds of smoke and dust obscured the field, Gregg met initial success as his regiments attacked across the creek en echelon to the left. The Federals checked the attack by early afternoon and counterattacked.

Union brigades continued to arrive on the field and deployed on both sides of the Utica Road, massing 22 pieces of artillery along the ridge to support the infantry. They pushed forward at 1:30 p.m. and drove the Confederates back across Fourteen-mile Creek. The fighting was confused because neither commander knew the location of his units. Union strength finally broke the Confederate right flank along the Utica Road and the battle ended with Gregg's retreat through Raymond and out the Jackson Road, where they bivouacked for the night near Snake Creek. McPherson's troops remained at the tiny village of Raymond. Major General Grant made his headquarters at Waverly, the home of Major John Peyton. Federal combat strength: 12,000. Casualties: 442 Confederate combat strength: 4,000. Casualties: 514

Reference used with permission, "A Guide to the Campaign & Siege of Vicksburg", State of Mississippi, Department of Archives and History, 1994.