This simple but sometimes effective form of defense structure was used by The British Army (mostly in their many desert campaigns). Seen around the early 19th Century in Afghanistan, local rocks of various sizes and shapes would be temporarily erected as a form of defensive wall (primarily when fighting from the prone position). Often Sandbags (which may not have been used due to the hardness of the regional soil) – would be used to create temporary defensive walls. Sangars have still been seen used by modern Armies as a filed expedient method of quick defense. Some Sangar positions were (and are) quite elaborate (depending on the time needed to erect).