... him how completely Savannah was invested at all points save only the plank-road on the South-Carolina shore, known as the Union causeway, which I thought I could reach from my left flank across the Savannah River . I explained to him that if he would simply engage the attention of the forts along Wilmington channel, at Beaulieu and Rosedew, I thought I could carry the defences of Savannah by assault as soon ...