...s on each flank, which were, however, repulsed. Longstreet and D. H. Hill joined A. P. Hill near nightfall, and the approach of Jackson on their flank caused the Federals to retreat next morning to Gaines's Mill and Cold Harbor. Here Fitz John Porter held a strong position, covering the principal bridges across the Chickahominy and protecting at the same time the York River railroad. Porter was reinforce...