[2] On June 1 of that same year, he joined Francisco del Rosario Sánchez, who at the head of an expedition entered Dominican territory crossing through Hondo Valle, Vallejuelo and El Cercado.
Knowing the border regions, Cabrera facilitated communication between Sánchez and General Santiago Rodríguez Masagó, who kept abreast of the expedition's plans and was willing to offer his support.
He did not accept the amnesty granted by the Spanish regime and remained in Dominican territory with his closest comrades in arms, Gume Fortuna and Pablo Reyes, as well as a small number of combatants with the intention of harassing the colonialists, while they established contact with the group commanded by Masagó, Pedro Antonio Pimentel and Benito Monción who planned the resumption of the war from Haiti.
Having failed in this action, he rejected the guarantees offered by the Spanish authorities and fled to the border area, taking refuge on a hill that was known by his name from then on, as well as a town today.
Later, he took part in the siege of the city of Santiago, in which he was chief of the Otra Banda canton and later, he also carried out missions in San José de las Matas.
In 1869, when Báez and his anti-national dictatorship were eagerly seeking the annexation of the country to the United States, Cabrera reaffirmed his status as a pro independence patriot and temporarily took Sabaneta by storm.