This primary source comes from the Records of the National Archives and Records Administration.
National Archives Identifier:
518141Full Citation: Cassius M. Clay Battalion Defending White House, April 1861. Washington, DC,; 4/1861; Records of the National Archives and Records Administration, Record Group 64. [Online Version, https://docsteach.org/documents/document/cassius-m-clay-battalion-defending-white-house-april-1861-washington-dc, May 4, 2024]