By November 1862, Loring was in Grenada, Mississippi, commanding a division in John C. Pemberton's Department of Mississippi and East Louisiana, another superior officer he had friction with. In early spring of 1863, he defended against the Yazoo Pass Expedition, before his division was ordered south to re-enforce Vicksburg. He was present at Pemberton's disastrous defeat at Champion Hill. Cut off from the rest of the army, most of his division then marched east to Jackson, Mississippi to join forces with Gen. Joseph E. Johnston for the impending siege. By the end of 1863, he was under the command of Lt. Gen. Leonidas Polk and defended east Mississippi from William T. Sherman during the Meridian Campaign of February 1864. Polk's relatively small force was then ordered to northwest Georgia to join Joe Johnston's Army of Tennessee, which was beginning to abandon its winter quarters in Dalton, Georgia to start the Atlanta Campaign. Polk's divisions, one commanded by Loring, arrived just in time to temporarily thwart a flanking maneuver by Union General James B. McPherson at the Battle of Resaca. Facing overwhelming numbers, Johnston's army was continuously flanked and forced to withdraw closer and closer to Atlanta.