Isaiah 37:33 - Ellicott's Commentary On The Whole Bible

Nor come before it with shields. — The clause points to the two forms of attack: (1) the invaders marching to the assault, protected by their serried shields against the darts and stones which were flung by hand or from engines by the besieged; and (2) the earthworks which were piled up to make the attack on the walls more feasible. (Comp. Habakkuk 1:10; Ezekiel 4:2.) Isaiah’s prediction is not only that Jerusalem will not be taken, but that the enemy, though now encamped around it, will not even proceed to the usual operations of a siege.