“…These features include not only artificial structures, such as fortifications (De Matos-Machado et al, 2015; Ilyés, 2010; Moss and Erlandson, 1992), trenches (Baer and Ashworth, 1981; Houx, 2001; Power, 2009), improvised explosive device (IED) command wires (McDonald and Schumer, 2016), bunkers and missile silos, among others, but also existing underground terrain (Eastler, 2004) or rock defences (Moss and Erlandson, 1992). The most famous example of trench warfare is the Western Front World War I, which has become the classic example of stalemate, attrition and futility in modern conflict (Baer and Ashworth, 1981). However, this class of features also includes direct geomorphological evidence, such as bomb and mine craters (Hupy and Schaetzl, 2006; Kiernan, 2015), uranium mining (Blustain, 2016) or landscape modification due to military structures (Yatsko, 2016).…”