It must seem to the casual reader of the history of the war of 1861-65, that enough has already been written upon the campaign of Chancellorsville. And there are numerous brilliant essays, in the histories now before the public, which give a coup-d'oeil more or less accurate of this ten-days' passage of arms. But none of these spread before the reader facts sufficiently detailed to illustrate the particular theory advanced by each to account for the defeat of the Army of the Potomac on this field