Giant Ancient Walls Discovered in the Biblical Libnah

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There is a place, sitting a top of the Judean foothills, that for past few years had been dug by archaeologists of the Ariel University. At first, this place seemed to be just a simple ancient town, but when they started digging, they found giant fortification walls, massive gates, and a layer of destruction that dates back a whole millennia before Christ.

So what was this place, why did the construct the giant walls and a fortification, and more importantly why was it destroyed?