Despite the title, the article is more concerned with the second Jewish Revolt (the Bar Kokhba Revolt) against Rome than the first (the Great Revolt). It has a good summary of the evidence found in the archaeologically recovered Bar Kokhba letters.
For many PaleoJudaica posts on the Bar Kokhba Revolt of 132-135 CE, see the posts collected here, plus here, here, and here.
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