I'm trying to get a sense for how devastating it was to Jews at the time relative to the Shoah of modern times.
Jewish Virtual Library in the article entitled 'Ancient Jewish History: The Great Revolt (66-70 CE)' says:' . . . the Great Revolt of 66-70, followed some sixty years later by the Bar Kokhba revolt, were the greatest calamities in Jewish history prior to the Holocaust. In addition to the more than one million Jews killed, these failed rebellions led to the total loss of Jewish political authority in Israel until 1948.' (The Great Revolt (66 - 70 CE) - Jewish Virtual Library)
The Gospel of Mark 13:19 reports that Jesus predicted that the days leading up to the destruction of the Temple would be 'days of distress unequaled from the beginning, when God created the world, until now—and never to be equaled again.' But in actual fact the Holocaust or Shoah surpassed the destruction of Jewish lives in those days manifold.