“In the twelfth year of King Ahaz of Judah, King Hoshea son of Elah began to reign in Samaria over Israel. He reigned nine years. He did what was evil in the sight of Yahweh, yet not like the kings of Israel who were before him. King Shalmaneser of Assyria came up against him. King Hoshea became his vassal and paid him tribute. But the king of Assyria found treachery in King Hoshea because he had sent messengers to King So of Egypt. He offered no tribute to the king of Assyria, as he had done year by year. Therefore the king of Assyria confined him up, and imprisoned him.”
King Hoshea had become a vassal of the king of Assyria. Remember he led the revolution against King Pekah, because he was losing the war with Assyria. King Hoshea concluded a peace treaty with the then King Tiglath-pileser III, just like the king of Judah had done. He cooperated with him and ruled for 9 years. Nevertheless he was not pleasing to Yahweh, but not as bad as the former kings. He decided to get help from the Egyptian King So. He stopped paying then King Shalmaneser V (727-722 BCE) of Assyria who had followed King Tiglath-pileser III (747-727 BCE). Thus the King Shalmaneser V of Assyria had King Hoshea put in prison.