Answer:
In Luke 19:43-44, Jesus prophesied about the coming destruction of Jerusalem, which would be carried out by the Roman army. This prophecy was fulfilled in A.D. 70, when the Roman army, under the leadership of Titus, besieged and destroyed Jerusalem.
Jesus said, "For the days will come upon you when your enemies will build an embankment around you, surround you and close you in on every side, and level you, and your children within you, to the ground; and they will not leave in you one stone upon another, because you did not know the time of your visitation."
When the Roman army besieged Jerusalem, they did exactly what Jesus had prophesied. They built an embankment around the city, surrounded it, and closed it in on every side. They also destroyed the temple and leveled the city, leaving not one stone upon another.
This destruction was a result of the rebellion of the Jewish people against the Roman Empire, which began in A.D. 66. The rebellion was characterized by a series of military campaigns and atrocities committed by both sides. The Roman army eventually defeated the Jewish rebels and destroyed Jerusalem in A.D. 70.
In this way, Jesus' prophetic words about judgment were fulfilled in the destruction of Jerusalem in A.D. 70.