Sometime before the year 1899, Baptiste either came into debt to Cuban officials, or earned their displeasure. For one of these reasons, he was sent to the island of Guarma to work in the sugar fields. At some point after arriving at Guarma, he joined the rebellion led by Hercule Fontaine, but was captured and, under unknown circumstances, he lost his left arm.
Events of Red Dead Redemption 2
Arthur is sent by Hercule to rescue some workers who have been captured. Before he reaches his destination, he is knocked unconscious by the Guarman military, resulting in his capture.
He wakes up tied to a chair in some ruins, and while his captor, Angel, is occupied with Baptiste, he manages to escape from the chair and takes down Angel. Arthur then cuts free both Baptiste and Leon Fuentes, who had also been captured. Arthur and Leon then venture to rescue some workers scheduled to be hanged, while Baptiste stays back due to his disability. After freeing the prisoners, Arthur and Leon regather with Baptiste.