Dan, as a native of the area it sounds to me like what you have on your place are field stones which were removed and stacked to one side to enable the land to be used. You can find similar arrangements all over the northern part of the state. About ten years ago I did the same thing on my place to develop a meadow, and I'm still doing the same thing to create more space for vegetable gardens. I call my arrangement the Great Wall of Arkansas -- it's about 100 yards long and about 3 feet high, and every darn rock was dug, carried and stacked by me and my wife. Like most of northern Arkansas, you can't put a shovel in the ground around here without hitting rocks.

Also, no soldier in his right mind would construct a fighting position from stones unless there was absolutely no other alternative. Ordnance not only ricochets when it strikes rocks, but worse, it can splinter and shatter rock and create its own shrapnel. Rocks are unhealthy places to be around when there's shooting going on. Digging in (not always possible in the rocky soil of northern Arkansas) or stacking logs was the preferred method of creating an impromptu fighting position.