...renches of the infantry at dark, Fitz. Lee's brigade holding the line of Longstreet's corps, Baker's, of Hill's corps, and the remainder of Ewell's corps. A pontoon bridge had been constructed at Falling Waters , some miles below Williamsport, where Longstreet's and Hill's corps were to cross and Ewell's corps was to ford the river at Williamsport, in rear of which last, after daylight, the cavalry was also ...