"Brother Against Brother" is the first of "The Blue and the Gray Army Series," which will include six volumes, though the number is contingent upon the longevity of one, still hale and hearty, who has passed by a couple of years the Scriptural limit of "threescore years and ten" allotted to human life. In completing the first six books of "The Blue and the Gray Series," the author realized that the scenes and events of all these stories related to life in the navy, which gallantly performed its full share in maintaining the integrity of the Union. The six books of "The Army and Navy Series," begun in the heat of the struggle thirty years ago, were equally divided between the two arms of the service; and it has been suggested that the equilibrium should be continued in the later volumes.