“SIR,--I am directed by General Doubleday to say, in answer to your letter of the 2d instant, that all negroes coming into the lines of any of the camps or forts under his command are to be treated as persons, and not as chattels. “Under no circumstances has the commander of a fort or camp the power of surrendering persons claimed as fugitive slaves, as it cannot be done without determining their character. “The additional article of war recently passed by Congress positively prohibits this. “The question has been asked, whether it would not be better to exclude negroes altogether from the lines. The General is of the opinion that they bring much valuable information which cannot be obtained from any other source. They are acquainted with all the roads, paths, fords, and other natural features of the country, and they make excellent guides. They also know, and frequently have exposed, the haunts of Secession spies and traitors and the existence of Rebel organizations. They will not, therefore, be excluded. “The General also directs me to say that civil process cannot be served directly in the camps or forts of his command, without full authority be obtained from the commanding officer for that purpose. “I am, very respectfully, your obedient servant, “E. P. HALSTED, _Assistant Adjutant-General_. “LIEUTENANT-COLONEL JOHN D. SHAUL, _Commanding Seventy-Sixth Regiment New York Volunteers_.” General Doubleday acted bravely at Fort Sumter; but he did not render a truer service to his country on that occasion than he has now done in this order. If this example were followed everywhere in our camps, we should at least save ourselves from shame, if we did not secure victory. Other generals at the West think they do their duty best, when they serve Slavery. There is General McCook, of whom we have the following sad report, on the authority of a paper at Nashville, recounting the visit of a slave-hunter to his camp.