The first use of balloons for military purposes by the French was in the Seige of Paris in '70-'71. 66 balloons with a total of 102 passengers were sent out, delivering 2 1/2 million letters to the outside world. They also carried 400 carrier pigeons for return messages. Of these 400 only 8 returned. 2 balloons were lost at sea and 6 captured by the Germans, but the rest landed safely. The last flight was on 28 Jan, 1871, carrying news of the Armistice.