In 1809, he organized a military expedition fight with the aim of returning Hispaniola, which now comprises the nations of the Dominican Republic and Haiti, back to Spanish rule.

[3] On February 17, 1797, the then appointed Governor of Puerto Rico Brigadier General Ramón de Castro, received news that Great Britain had capture the island of Trinidad.

At the Martín Peña Bridge, they were met by the likes of Sergeants José and Francisco Díaz and Conti who together with Lieutenant Lucas de Fuentes attacked the British with two cannons.

The invasion failed because Puerto Rican volunteers and Spanish troops fought back and defended the island in a manner described by a British lieutenant as of “astonishing bravery".

However, Toussaint Louverture's lieutenants, plus the spread of yellow fever, succeeded in expelling the French again from Saint-Domingue, which in 1804 the rebels made independent as the Republic of Haiti.

Col Conti together with naval Captain Ramón Power y Giralt, a Puerto Rican, distinguished themselves with the defense of the Dominican Republic against an invasion from the French forces by enforcing a blockade with the aid of Great Britain (Spain's ally at the time) and Haiti,[8] returned Santo Domingo to Spanish control.