shall recount his worthies - (Nah 3:18). Review, or count over in his mind, his nobles, choosing out the bravest to hasten to the walls and repel the attack. But in vain; for
they shall stumble in their walk - “they shall stumble in their advance” through fear and hurry.
the defence shall be prepared - rather, the covering machine used by besiegers to protect themselves in advancing to the wall. Such sudden transitions, as here from the besieged to the besiegers, are frequent (compare Eze 4:2), [Maurer]. Or, used by the besieged Assyrians [Calvin].