As separatists movements in Cuba and Puerto Rico grew, Sucre planned by 1838 to give a full support to those groups.
The first movement was to reach an agreement with Britain and the United States. In exchange of commercial privileges in the liberated islands and the Colombian continent, the two Anglo powers would hinder any Spanish counter attack.
Sucre gathered a 10,000 men army and shipped it with 600 horses. 4,000 disembarked at Puerto Rico and 6,000 in Cuba, where they joined local independentist militias.
The Colombian Navy took positions and begun bombing royalists fortifications. No reinforcements came from Spain, partly by the Carlist civil war fought home, partly for the British and American blockade.
Santiago was finally taken in January, 1839. San Juan in February and Havana in April. Cuba and Puerto Rico claim independence and most of the Colombian army came back home. Nevertheless, Colombian Navy was left longer patrolling the Cuban and Puerto Rican waters.
Britain arbitrated the armistice between Colombia and Spain. Spain would recognize Puerto Rican and Cuban independence and these nations would become Colombian protectorates.
In October of 1839, Simón Bolívar died in London.