Shouldn't it be "cada UNA en un bando" if it's referring to the cartas?
Dictation exercise A2
Here "cada uno en un bando" (each one in a [different] side/bloc] is referring to her grandfather and her grandmother. The text is not talking about any specific war but this is referring to the Spanish civil war in the 30s. There were two main sides: el bando republicano and el bando nacional.
We use the default masculine "uno" when we are talking about two people, one masculine and one feminine.
I hope this clarified it.
My mistake, I thought "each one" was referring to the letters and that bando was some kind of ribbon. Thanks.
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