To attack the Marquessa Rum Distillery in Firebrand in Far Cry 6 shoot the rum tank on the east side of the rum distillery under the walkways and the rum tank under the walkways in the centre of the distillery.

From the upper walkways, drop down to the big building and go into it through the window and destroy the two rum tanks inside.

Go back out and shoot another rum tank on the upper platform on the west side of the centre of the distillery. To complete the mission, shoot as many of the red shipping crates scattered throughout the distillery as required.