Farroupilla takes place many years before SOUTH 3D, more specifically during the Farroupilha Revolution; historical conflict that marked the attempt of Rio Grande do Sul to separate from the Brazilian Empire and form an independent republic. During the game you will have to face the imperial soldiers, all dressed in the uniforms of the time, as well as infiltrate military bases to obtain information that will help you to free the black spearmen who were captured by the imperial army.
This DLC is only available in Portuguese

https://store.steampowered.com/app/2009200/SUL_3D__Farroupilla/