He’s actually describing two things: the civil war fought within Jerusalem’s walls itself, and the Roman siege of Jerusalem that led to its fall in 70 AD.
Revelation is a “prophetic exposition” of the Olivet Discourse at which, according to the Gospel of Mark, John was one of the four disciples present. Wonder why there is no Olivet Discourse in John’s gospel? It’s because while the other gospel writers devoted about two chapters to it, John wrote an entire book about it.
Revelation has nothing to do whatsoever with the time in which we live until you get to chapter 21, wherein John describes the nature of Christ’s kingdom: His church.
We live in the “new heavens and earth”, as the old heavens and earth - the old covenant kingdom and theocracy of Israel - was violently overthrown by Christ in retaliation for “all the righteous blood shed on earth” (Matt.23).
When read in the context of God’s old testament judgments, Revelation falls into place as the final recorded prophecy of God’s judgment against Israel.
In other words, Revelation was not written to us, about us, or the time in which we live.
Those ideas have been so completely blown away for so long its beyond laughable and way into crying time!
Revelation was written between AD 92 and 94. This was Polycarp’s best contribution to defeating Satan’s preterists.