I'd like to interrupt the flow here with a short treatise by an amateur (me) on the types of fencing you are likely to see at Civil War battle sites. The most common is the Virginia Fence, which tends to be zig-zag, and the other is the Kentucky Fence. Both are split-rail fences. Remember the legends of Abe Lincoln splitting rails? He was making one or the other of these. Split rails are triangular in cross section as they are made by driving wedges into tree trunks, resulting in a section of a circle or column. Kentucky fences in their more primitive forms used split rails and had 2 to 4 rails per segment. The form of these closely resemble the modern Kentucky fences, which you may be familiar with for their whiteness and because they enclose horse pastures, often thoroughbred horse pastures.
Much more prevalent were the Virginia fences, which came in many forms, but also used split rails. While the Kentucky fences used upright posts that were mortised out for the rails, Virginia fences were often just split rails laid atop each other, and the zig-zag pattern was only so these dubious constructions wouldn't fall down. These fences were called "Worm" or "Snake" fences and they were some times supported to a degree by more or less upright standards, in the best cases two crossed. Sometimes they were also built straddling a low stone wall.
Following are some examples of each. Originally, chestnut wood was preferred for these, but with the blight cedar was substituted. I believe that hickory was also used often.
This is supported Virginia fence.
