Early on April 7, while Mahone's men were attempting to set fire to the High Bridge and wagon bridge, the Union II Corps commanded by Major General Andrew A. Humphreys arrived on the scene. Humphreys's second division under Brigadier General Francis C. Barlow, including the 19th Maine Volunteer Infantry Regiment, charged the burning structure and saved a large section of the railroad bridge, preventing major damage. They crossed the lower wagon bridge to move on Lee's flank and forced the hungry Confederates to resume their retreat before re-provisioning themselves.