Letters were a lifeline for people in war, whether fighting it or waiting for someone who was, or simply trying to avoid becoming collateral damage. So, hard to imagine the communication vacuum this short sentence implies; a population essentially held incommunicado.
‘Trains, telephones, and posts will be under German control; no private letters are allowed.’
Source: Iris Origo, War in Val d’Orcia: A Diary, Edinburgh: John Cape Travellers’ Library, 1951 (1947), p. 72
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