Isaiah speaks of the Assyrian king’s invasion of the kingdom of Judah. He had very brief success against some of the cities north of Jerusalem as listed in verses 28-32 (Aiath, Migron, Michmash, Geba, Ramath, Gibeah, Gallim, Laish, Anathoth, Madmenah, Gebim). This is the indignation spoken of. The Lord would not let this success continue for long. Through Isaiah, He had promised Hezekiah, ’He shall not come into this city, nor shoot an arrow there…For I will defend this city, to save it, for mine own sake, and for my servant David‘s sake’ (2 Kings 19:34).