After his victory at Port Gibson on May 1, 1863, Maj. Gen. Ulysses S. Grant moved his Army of the Tennessee northeast through Mississippi toward the Southern Railroad, hoping to cut off supplies and reinforcements from reaching the Confederates defending Vicksburg. Grant’s army moved in three columns. On May 12, his right flank approached Fourteenmile Creek, just west of Raymond. Around 10:00 am, Maj. Gen. James B. McPherson’s XVII Corps encountered Brig. Gen. John Gregg’s Confederate brigade in battle formation on the opposite bank of the creek. McPherson outnumbered the Confederates 10,000 to 3,000, but poor reconnaissance led Gregg to believe he was facing equal odds. He ordered an attack across the creek that staggered the men of McPherson’s lead elements, but Gregg's soldiers were eventually forced back by the weight of Union numbers and nearly annihilated. The battle drove a wedge between Vicksburg and Confederate reinforcements, and allowed Grant to simultaneously move further east toward Jackson and north toward the railroad.