Aerial view of a military base and field hospital. One of a series of British aerial reconnaissance photographs recording the positions of trenches on the Western Front during the First World War. Fields surrounding a military camp, probably British, is riddled with square-toothed trenches and bomb craters. An original caption points out a field hospital on the right, presumably the building marked with a cross. Nord-Pas de Calais or Picardie, France, 3 February 1918., Nord-Pas de Calais, France