Tilgathpilneser

Pul the king of Ashur invaded the land. Menachem gave Pul thirty-three tons of silver, so that he would confirm Menachem's hold on the kingdom.

and his son Be'erah. Tilgat-Piln'eser king of Ashur carried him away captive; he was leader of the Re'uveni.

So the God of Isra'el stirred up the spirit of Pul king of Ashur and the spirit of Tilgat-Piln'eser king of Ashur; and he carried them away as captives - the Re'uveni, the Gadi and the half-tribe of M'nasheh - and brought them to Halach, Havor, Hara and to the Gozan River, where they are to this day.

Tilgat-Piln'eser king of Ashur attacked and besieged Achaz instead of strengthening him -

When Efrayim saw his sickness and Y'hudah his wound, Efrayim went to Ashur and sent envoys to a warring king; but he can't heal you or cure your wound.

It will be carried to Ashur as a present for a warring king. Efrayim will be put to shame, and Isra'el be ashamed of his own advice.