They thought it was a good idea more helpers more work done
I have chose primary source to be the answer. Check out the definition of "primary source." secondary wouldn't make sense here.
Key was inspired by the sight of a lone U.S. flag still flying over Fort McHenry at daybreak, as reflected in the now-famous words of the “Star-Spangled Banner”: “And the rocket's red glare, the bombs bursting in air, Gave proof through the night that our flag was still there.”