Jamieson, Fausset and Brown on Ezekiel 19:9

9. in chains--(2Ch 36:6; Jr 22:18). Margin, "hooks"; perhaps referring to the hook often passed through the nose of beasts; so, too, through that of captives, as seen in the Assyrian sculptures (see on Eze 19:4).

voice--that is, his roaring.

no more be heard upon the mountains--carrying on the metaphor of the lion, whose roaring on the mountains frightens all the other beasts. The insolence of the prince, not at all abated though his kingdom was impaired, was now to cease.