Samaria was the capital of Israel.  Jerusalem was the captial of Judah.  Both experienced the onslaught of the Assyrians.  For Samaria it was the climax of Gods efforts to call them to repentance for their idolatry.  They refused to repent and were over-run and carried off as a result.  Hezekiah, king of Judah was seeking to obey God and the Assyrians mocked his trust.  God miraculously delivered Jerusalem for the sake of his name,