The Confederates didn't have better luck at the Battle of Raymond. On May 10, 1863, Pemberton sent troops from Jackson to Raymond, to the southwest. Brig. Gen. Gregg had an over-strength brigade, but they had endured a grueling march from Port Hudson, Louisiana, arriving in Raymond late on May 11. The next day he tried to ambush a small Union raiding party. The party was Maj. Gen. John A. Logan's Division of the XVII Corps. Gregg tried to hold Fourteen Mile Creek, and a sharp battle ensued for six hours, but the overwhelming Union force prevailed and the Confederates retreated. This left the Southern Railroad of Mississippi vulnerable to Union forces, severing the lifeline of Vicksburg.