Jules Guex (1833-1918) was a Swiss national who was caught in the German siege of Paris from September 1870 to January 1871. He and his wife, Louise Adele Begue Guex (1839-1884) helped to organize a Swiss ambulance in the Collège Chaptal (now the Lycée Chaptal). His activities in rescuing the wounded enabled him to view the movements of both French and Prussian troops. In this 250-page journal Guex describes the siege of Paris from September 19, 1870 to January 28, 1871 during the war between France and the German states (North German Confederation led by Prussia) which began in July 1870. It reports on the establishment of the Paris Commune, a socialist government, which lasted from March to May of 1871.