This was an attempt to do an earthen palisade somewhat simply. I ran it at an angle so that it seems one of the corners of the works are depicted. The earth wall was created by gluing balsa wood as a frame onto the plastic styrene base. Then I glued bass wood planks behind it for the sentries to be walking along (can't see it from this shot, though). The sharpened stakes in the ditch in front of the wall are metal straight pins. I used a pushpin to create the hole for it, then pushed the pins in and glued them into place with epoxy.
Then, I coated the balsa frame with my favorite "earth" mixture: white glue mixed with Woodland Scenics Turf. It was nice and thick and molded itself somewhat irregularly around the rectangular frame. I painted it a dark brown, drybrushing successive lighter shades atop it. The earth mixture even cracked a bit to look like dried earth, which was brought out more by the black wash I finished it off with.
The tent is from Musket Miniatures, purchased from Dayton Painting Consortium. The sentries are old, old Heritage 15mm Romans that I repainted to man the earthworks. You can barely see the cookfire in front of the tent in the picture above, which was simply tiny stones glued into a ring with the center painted black. I blackened some of the stones and put a dark wash over them, as well. A nice and simple, but effective camp, I felt, that could be used for about any Roman army from its beginnings to the late empire.