Mr. Seward to Mr. Dayton
Sir: Applications heretofore made by foreign governments for officers in their military service to visit the United States armies for professional observations have hitherto been complied with, and many such officers have repaired. to points where those armies have been stationed. As yet no French officers have presented themselves for that purpose, but as it is not unlikely that some may soon be expected, it is proper I should inform, you that, in view of the movements of our forces on an extended scale, which are about to commence, while we adhere to the same rule of comity as a general one; yet, that at the present moment, the Secretary of War deems it expedient to make an exception of the army of the Potomac. Pursuant to this decision, Mr. Stanton has already rejected numerous applications on behalf of British officers, and will deem himself compelled, at present, to pursue the same course in respect to any French officers in whose behalf similar applications may be made. You will make known this decision to Mr. Drouyn de l’Huys with a view to anticipate any disappointment which it may occasion.
I am, sir, your obedient servant,
William L. Dayton Esq., &c., &c., &c.