First, the stone wall sections are built up from a Litko 120mm x 30mm base using a bag of talus from a model railroading supply store. Using tacky glue, rocks were piled one on another, allowed to dry, and then hit with a spray of flat black. Later a dry brush of light gray, a Minwax stain, a spray of Dullcote and voila, finished.
Second up was the rail fence. This took some thought on how to build and later store a worm rail fence. Using some old, surplus balsa laying around, I built five sections of three rail fence.
The sections can then be positioned anywhere from a 90 degree bend to 180 degrees. Sections, when disassembled can store flat yet pieced together to make a worm rail fence. Five fence sections are a start but not nearly enough for frontier battlefields.
Both of these linear obstacles will work well on the North American frontier in either 28mm French & Indian War or American War of Independence games. These items provided a quick, inexpensive, and relatively easy addition to the gaming table.