Mystery unfolds over 1870 Paris siege letter discovered in Australia

The son-to-mother letter, sent to Normandy by balloon from a Paris beseiged by Prussians, was inexplicably found in Australia's National Archives.

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When A Mesnier wrote to his mother in December 1870, Paris was under siege. The Prussians had surrounded the capital, food supplies were running low and temperatures had dropped below freezing, reports BBC News.