Micah 1:6

"Therefore I will make Samaria as a heap of the field, and as places for planting vineyards; and I will pour down the stones thereof into the valley, and I will uncover the foundations thereof."

The fact of this verse being a prophecy of what God promised that he would do indicates that the prophecy was written some time prior to 722 B.C., at which time the most terrible fulfillment of all that was promised here actually occurred. Sargon I I, completed the seige in the latter part of 722 and the first part of 721 B.C., having succeeded to the Assyrian throne after Shalmaneser had begun the siege over two years earlier. Samaria, situated on a great butte, with steep walls on all sides, was completely subdued, the stones of many of its structures being rolled down the walls of the butte, "into the valley." The very foundations of it were uncovered.

Unbelievers of any such things as predictive prophecy are greatly troubled by such a glorious example of it, hence all of the efforts to change either the date or the wording of the book of Micah. See more on this under Micah 5:2.