As in many of the prophecies, there is to be both a precursive fulfillment, in this case the coming invasion of Israel and Judah by the unspeakably cruel and wicked Assyrians, and a final fulfillment, the northern invaders of Israel in the last days, as described particularly in Ezekiel 38. The term "Assyrian" seems, in fact, to be a title of the coming Antichrist (Micah 5:5,6).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8