Barrage: The Leeghwater Project Board GameDescriptionSpecificationsShipping Barrage: The Leeghwater Project Expansion The Leeghwater Project Expansion adds: A new faction, the Netherlands, that uses Jan Leeghwaters expertise in water management, adding even more water to your dams. The External Works mechanic, a set of powerful tiles that can be obtained from a new action space. With them you'll be able to perform many actions, but be careful. To unlock the External Works power you'll need to