Jamieson, Fausset and Brown on Mark 13:19

19. For in those days shall be affliction, such as was not from the beginning of the creation which God created unto this time, neither shall be--Such language is not unusual in the Old Testament with reference to tremendous calamities. But it is matter of literal fact that there was crowded into the period of the Jewish war an amount and complication of suffering perhaps unparalleled; as the narrative of Josephus, examined closely and arranged under different heads, would show.