... treachery, the men burned the barns and out-buildings of John A. Seddons, the rebel Secretary of War, and it is, perhaps, fortunate that the gentleman himself was not present. Retracing his steps, Colonel Dahlgren marched down the river road, destroying the Dover flour-mills, several flouring establishments and saw-mills. His force also did considerable injury to the James River Canal, burning canal-boats an...