Here’s the table again. The fortress is basically assembled here, with some painting started on the table itself.
We did most of it with the Spray gun, adding green in simple patterns to simulate water. This was later painted with varnish, for a pretty simple effect.
The hill that the fortress sits on has been heavily modified, sawed into, and smaller cliffs were added with Green stuff.
The bridge was (obviously) painted separately.

Sthlm Warpaint