Don't even need the Niter but I've got to give the man something to do.
He got too excited and worked himself to death
.
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I so wish this ability were more common. There should be a civilian unit dedicated to it. Maybe the Military Engineer, which comes late enough? It just feels like a waste otherwise. This looked too fun to skip but I'll probably regret it later when I need it for that uranium just outside city range.
Anyway, just need to plant Woods next to the Furs and on the Rice tile to create a three-tile wall for my Voi Chien/Field Cannons, then a Thanh between the Dam and the Niter or the Desert tile. Portugal is never getting close to (let alone cross) that river again.