If you look at Luke chapter 21, and Matthew 24, you'll see that Jesus was simply predicting the Roman armies coming to destroy the Jewish Temple, and that this was His "parasouia" (presence), coming in judgment against the Jews who rejected Him as Messiah.
This actually was fulfilled within a generation, 37 years later.
Not one prophecy in the Bible came true as foretold. Let's look at everything Jesus said about Roman armies ....
..... And that's it. Nothing. He said nothing about them.