Cabello belonged to the "Lodge Independence", active since 1805 in Buenos Aires, directed by Juan José Castelli, which intended to garner British support for separating the Spanish territories from their parent country. During the British invasion, many Creoles collaborated with the British. Many of them did so in secret, but Cabello agreed to hold a public position in the government of invading Governor William Carr Beresford. When the Reconquista occurred by the Creole and Spanish, Cabello was arrested and charged with treason against the King, and was taken prisoner at Montevideo.
