As a king ready to the battle - Fully prepared for a battle; whom it would be vain to attempt to resist. So mighty would be the combined forces of trouble and anguish against him, that it would be vain to attempt to oppose them.
Related Commentaries of Job 15:24
Job 15:24
24 Trouble and anguish shall make him afraid; they shall prevail against him, as a king ready to the battle.