Verse 13 will be clear if thus read: "Behold the land of the Chaldeans! That people did not exist at the time that the Assyrian founded it, ie., Tyre, (as a port) for them that dwell in the Wilderness; they (the Assyrians) set up its towers, they raised up its palaces; but he (Nebuchadnezzar) shall bring it to ruin."
The argument is: Tyre boasted of its antiquity and strength (v.7). The prophet pointed to Assyria, a much more ancient and much stronger government, and urged that if it fell before the king of the Chaldeans, how much more surely would Tyre fall!
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