Narciso Lopez, lands at Puerto Principe, Cuba, with a militia of 400 and the intention of liberating the Spanish enclave for the united States.
Postscript: Most of the filibusters were killed or executed upon their first encounter with the Army of Spain.
[added 9/21/2026]
Subsequent Events:
References:
Robert E. May, The Southern Dream of a Caribbean Empire, 1854-1861, (Baton Rouge, Louisiana State University Press, 1973), 28-29.