At all events the Israelitish ambassadors were grossly insulted, and a long war with Ammon began.
Campaign followed upon campaign; the City of Waters, Rabbah, the "capital" of Ammon, was closely invested, and the Aramaic allies of Hanun were put to flight.

Rabbah fell at last; its defenders were tortured and slain, and the kingdom of Ammon annexed to the Israelitish empire.
When it recovered its independence we do not know.

In the days of Assyrian conquest in the West it was already again governed by its own kings.

One of them, Baasha, the son of Rehob, was, like Ahab of Samaria, an ally of Damascus against the Assyrian invader, and we hear of two others, one of whom bears the same name as "Shinab, King of Admah." The storm of Babylonian conquest which overwhelmed Judah spared Ammon; after the destruction of Jerusalem Baalis was still king of the Ammonites, and ready to extend his power over the desolated fields of Judah.[7] The language of Ammon, if we may argue from the proper names, was, like that of Moab, a mere dialectal variety of that of Israel.

The "language of Canaan" must have been adopted by the Ammonites and Moabites just as it was by the Israelitish tribes.