The God of Israel stirred up the spirit of Pul king of Assyria, and the spirit of Tilgath Pilneser king of Assyria, and he carried them away, even the Reubenites, and the Gadites, and the half-tribe of Manasseh, and brought them to Halah, and Habor, and Hara, and to the river of Gozan, to this day.
God was not only faithful to bless as He had promised, but He also judged sin as He had said He would (1 Chronicles 5:25-26). This is the reason the Transjordanian tribes went into captivity.