 He guessed (incorrectly) that the troops facing Hancock had been withdrawn from Laurel Hill.He ordered Hancock to withdraw north of the Po, leaving a single division in place to occupy the Confederates in that sector, while the rest of his army was to attack at 5 p.m. across the entire Confederate line, which would identify and exploit any potential weak spot.Hancock left Francis C. Barlow's division in behind hasty earthworks along Shady Grove Church Road and withdrew the remainder of his men north of the Po.