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From Wikipedia:
In 1871 during the Franco-Prussian War, when Paris was surrounded by Prussian troops, the French military used hot air balloons to transport homing pigeons past enemy lines. Microfilm images containing hundreds of messages allowed letters to be carried into Paris by pigeon from as far away as London. More than one million different messages travelled this way during the four month siege.
I cannot resist.
In 1871 during the Franco-Prussian War, when Paris was surrounded by Prussian troops, the French military used hot air balloons to transport homing pigeons past enemy lines. Microfilm images containing hundreds of messages allowed letters to be carried into Paris by pigeon from as far away as London. More than one million different messages travelled this way during the four month siege.
I cannot resist.