Johnston, severely outnumbered, hoped to combine his force with a detachment of Robert E. Lee's army from Virginia, jointly defeat Sherman, and then return to Virginia for an attack on Ulysses S. Grant. Lee initially refused to cooperate with this plan. (Following the fall of Richmond in April, Lee attempted to escape to North Carolina to join Johnston, but it was too late.) Recognizing that Sherman was moving quickly, Johnston then planned to consolidate his own small armies so that he could land a blow against an isolated portion of Sherman's army, which was advancing in two separated columns. On March 19, 1865, Johnston was able to catch the left wing of Sherman's army by surprise at the Battle of Bentonville and briefly gained some tactical successes before superior numbers forced him to retreat to Raleigh, North Carolina. Unable to secure the capital, Johnston's army withdrew to Greensboro.