Gun positions and road screens. One of a series of British aerial reconnaissance photographs recording the positions of trenches on the Western Front during the First World War. An original caption indicates gun positions within an area of plantation (the central dark square), and points out the shadows of road screens as a series of dark lines in the bottom right hand corner. Nord-Pas de Calais or Picardie, France, 30 January 1918., Nord-Pas de Calais, France, Western Europe, Europe .