...expecting to make the next issue at Richmond, and on the morning of December 11th, in a dense fog that concealed his movements, his pontoon builders hastened to the bank of the Rappahannock, opposite Fredericksburg , to throw a bridge for the passage of Sumner's corps, and another, a short distance below, for the crossing of Franklin's corps, while 143 of his big guns, along a line more than three miles in lengt...