Cher Ami, an American veteran of the First World War, was credited with carrying the message that saved 200 men of the “Lost Battalion” during the Battle of the Argonne in 1918–despite losing a leg and an eye to shell splinters in the maelstrom of battle. Decorated with the French Croix de Guerre, he was preserved after death and can still be seen on display in the American Museum of Natural History.

At midnight on November 12, 1870, two French balloons, inflated with highly flammable coal gas and manned by desperate volunteers, took off from a site in Monmartre, the highest point in Paris. The balloons rose from a city besieged—the Franco-Prussian War had left Paris isolated, and the city had been hastily encircled by the Prussian Army—and they did so on an unlikely mission. They carried with them several dozen pigeons, gathered from lofts across the city, that were part of a last-ditch attempt to establish two-way communication between the capital and the French provisional government in Tours, 130 miles southwest.

Paris had been encircled since mid-September. By early autumn, with the prospects of relief as distant as ever, and the population looking hungrily at the animals in the zoo, the besieged French had scoured the city and located seven balloons, one of which, the Neptune, was patched up sufficiently to make it out of the city over the heads of the astounded Prussians. It landed safely behind French lines with 275 pounds of official messages and mail, and before long there were other flights, and the capital’s balloon manufacturers were working flat out on new airships.

The work was dangerous and the flights no less so—2.5 million letters made it out of Paris during the siege, incalculably raising morale, but six balloons were lost to enemy fire and the ones that survived that gauntlet, historian Alastair Horne observes, “were capable of unpredictable motion in all three dimensions, none of which was controllable.”

The French prepare a balloon for launch during the Siege of Paris, 1870. Pigeons carried out by balloon helped establish two-way communication with the city.

Of the two balloons in the pigeon flight, one, the Daugerre, was shot down by ground fire as it drifted south of Paris in the dawn, but the other, the Niepce, survived by hastily jettisoning ballast and soaring out of range. Its precious pigeon cargo would return to the city bearing messages by the thousand, all photographed using the brand-new technique of microfilming and printed on slivers of collodium, each weighing just a hundredth of an ounce. These letters were limited to a maximum of 20 words and they were carried into Paris at a cost of 5 francs each. In this way, Horne notes, a single pigeon could fly in 40,000 dispatches, equivalent to the contents of a substantial book. The messages were then projected by magic lantern onto a wall, transcribed by clerks, and delivered by regular post.

A total of 302 largely untrained pigeons left Paris in the course of the siege, and 57 returned to the city. The remainder fell prey to Prussian rifles, cold, hunger, or the falcons that the besieging Germans hastily introduced to intercept France’s feathered messengers. Still, the general principle that carrier pigeons could make communication possible in the direst of situations was firmly established in 1870, and by 1899, Spain, Russia, Italy, France, Germany, Austria and Romania had established their own pigeon services. The British viewed these developments with some alarm. A call to arms published in the influential journal The Nineteenth Century expressed concern at the development of a worrying divergence in military capability. The Empire, it was suggested, was being rapidly outpaced by foreign military technology.

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