This primary source comes from the War Department Collection of Confederate Records.
National Archives Identifier:
4688375Full Citation: Telegram from Jefferson Davis to General S. Cooper Announcing the Confederate Victory at Manassas; 07/21/1861; War Department Collection of Confederate Records, Record Group 109. [Online Version, https://www.docsteach.org/documents/document/telegram-from-jefferson-davis-to-general-s-cooper-announcing-the-confederate-victory-at-manassas, March 28, 2024]