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 and forced to work in the sugar fields. At some point after arriving, 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
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.
Red Dead Redemption 2