... Jackson was expected to turn this line, but being yet behind, A. P. Hill engaged the Federal forces and made attempts 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 p...