This primary source comes from the Records of the Office of the Secretary of War.
National Archives Identifier:
3854706Full Citation: Telegram from Lieutenant General Ulysses S. Grant to Major General H. Halleck; 8/9/1864; Records of the Office of the Secretary of War, Record Group 107. [Online Version, https://www.docsteach.org/documents/document/telegram-from-lieutenant-general-ulysses-s-grant-to-major-general-h-halleck, May 7, 2024]