San Juan de Ulúa, a fortress complex on an island overlooking Veracruz, Mexico
Aboard Hecla, Clitz arrived in Mexican waters at Isla de Sacrificios off Veracruz on the morning of 29 March 1847 and participated in the final day of the siege of the city before it ended with the surrender of the Castle of San Juan de Ulúa to American forces that evening.
Richard Hakluyt's book, The Principal Navigations, Voiages, Traffiques and Discoueries of the English Nation (1598–1600), claims Drake and Hawkins were on a private venture, peacefully trading with the local colonial Spaniards in violation of Spanish law, when a Spanish naval fleet arrived.
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In other actions, the viceroy inspected the fortifications of San Juan de Ulúa, near Veracruz, and suspended work on the drainage system of Mexico City and the construction of a convent in Guanajuato for lack of money.
The original name San Juan was bestowed by a veteran of the Mexican-American War who settled there in 1853 because he thought the site looked like San Juan de Ulúa near Veracruz.