Nor come before it with shield - The "shields" of the Assyrians are very conspicuous in the sculptures, and were of great importance in a siege, since the assailing archers were in most instances defended, as they shot their weapons, by a comrade, who held before himself and his friend a shield of an enormous size. It was made of a framework of wood, filled in with wattling, and perhaps lined with skin; it was rested upon the ground, and it generally curved backward toward the top; ordinarily it somewhat exceeded the height of a man. From the safe covert afforded by these large defenses the archers were able to take deliberate aim, and deliver their volleys with effect.

Nor cast a bank against it - "Mounds" or "banks" were among the most common of the means used by the Assyrians against a besieged town. They were thrown up against the walls, and consisted of loose earth, trees, brushwood, stones, and rubbish. Sometimes the surface of the mound was regularly paved with several layers of stone or brick, which formed a solid road or causeway capable of bearing a great weight. The intention was not so much to bring the mounds to a level with the top of the walls, as to carry them to such a height as should enable the battering-ram to work effectively. Walls were made very solid toward their base, for the purpose of resisting the ram; halfway up their structure was comparatively weak and slight. The engines of the assailants, rams and catapults, where therefore far more serviceable if they could attack the upper and weaker portion of the defenses; and it was to enable them to reach these portions that the "mounds" were raised.

He shall not, etc. - Here follow the fullest proofs that Jerusalem shall not be taken by the Assyrians.

1. He shall not come into this city;

2. He shall not be able to get so near as to shoot an arrow into it;

3. He shall not be able to bring an army before it,

4. Nor shall he be able to raise any redoubt or mound against it;

5. No; not even an Assyrian shield shall be seen in the country; not even a foraging party shall come near the city.

Therefore thus saith the LORD concerning the king of Assyria, He shall not come into this city, nor shoot an arrow there, nor come before it with shield, nor cast a bank against it.

19:32 He shall not - The army sent with Rabshaketh did not form a close siege against it, but only disposed themselves so as to block it up at some distance; possibly waiting 'till the king of Assyria had taken Libnah and Lachish, (which they presumed he would speedily do.)

19:20-34 All Sennacherib's motions were under the Divine cognizance. God himself undertakes to defend the city; and that person, that place, cannot but be safe, which he undertakes to protect. The invasion of the Assyrians probably had prevented the land from being sown that year. The next is supposed to have been the sabbatical year, but the Lord engaged that the produce of the land should be sufficient for their support during those two years. As the performance of this promise was to be after the destruction of Sennacherib's army, it was a sign to Hezekiah's faith, assuring him of that present deliverance, as an earnest of the Lord's future care of the kingdom of Judah. This the Lord would perform, not for their righteousness, but his own glory. May our hearts be as good ground, that his word may strike root therein, and bring forth fruit in our lives.