 Complete the following phrase:  After Grants army slipped past Lees army to cross the James River, Hancock found himself in a position from which he might have ended the war. His corps arrived to support William Farrar Smiths assaults on the lightly held Petersburg defensive lines, but he deferred to Smiths advice because Smith knew the ground and had been on the field all day, and no significant assaults were made before the Confederate lines were reinforced. One of the great opportunities of the war was lost. After his corps participated in the assaults at 