Viviane,
<<Which specific prophecy came true exactly as he said?>>
Actually every last prediction (all these things) happened to Christ's own generation. Here is one specific item to consider:
"...for there shall be great distress in the land, and wrath upon this people. And they shall fall by the edge of the sword, and shall be led away captive into all nations..."
"It is fitting to add to these accounts the true prediction of our Saviour in which he foretold these very events. His words are as follows: "Woe unto them that are with child, and to them that give suck in those days! But pray ye that your flight be not in the winter, neither on the Sabbath day; For there shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be." The historian, reckoning the whole number of the slain, says that eleven hundred thousand persons perished by famine and sword, and that the rest of the rioters and robbers, being betrayed by each other after the taking of the city, were slain. But the tallest of the youths and those that were distinguished for beauty were preserved for the triumph. Of the rest of the multitude, those that were over seventeen years of age were sent as prisoners to labor in the works of Egypt, while still more were scattered through the provinces to meet their death in the theaters by the sword and by beasts. Those under seventeen years of age were carried away to be sold as slaves, and of these alone the number reached ninety thousand. These things took place in this manner in the second year of the reign of Vespasian, in accordance with the prophecies of our Lord and Saviour Jesus Christ, who by divine power saw them beforehand as if they were already present, and wept and mourned according to the statement of the holy evangelists, who give the very words which be uttered, when, as if addressing Jerusalem herself, he said: "If thou hadst known, even thou, in this day, the things which belong unto thy peace! But now they are hid from thine eyes. For the days shall come upon thee, that thine enemies shall cast a rampart about thee, and compass thee round, and keep thee in on every side, and shall lay thee and thy children even with the ground." And then, as if speaking concerning the people, he says, "For there shall be great distress in the land, and wrath upon this people. And they shall fall by the edge of the sword, and shall be led away captive into all nations. And Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled." And again: "When ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh." Eusebius (Book III, Ch. VII)