When the red and gold banner of Spain was unfurled over the Castillo at St. Augustine on Tuesday morning, July 10, 1821, the Castillo guns roared a salute. Later in the day the cannon fired again, and the 23-star flag of the United States was hoisted above the ramparts beside the Spanish banner. U. S. troops formed near the Castillo. Again the guns thundered, and as the echoes died away, Spain’s flag came slowly down. A detachment from the American force marched over the drawbridge into the Castillo, where the drums beat the change of guard.
Manucy, Albert C.
"Some Military Affairs in Territorial Florida,"
Florida Historical Quarterly: Vol. 25:
2, Article 6.
Available at: https://stars.library.ucf.edu/fhq/vol25/iss2/6