ישעיהו, פרק ל״א, פסוק ט׳

The downfall of the Assyrian army is a scene of total military collapse, standing in stark contrast to God's fierce protection over Jerusalem. The once-unbreakable might of Assyria crumbles entirely. Some commentators view this collapse metaphorically, noting that the nation's core strength and power simply vanish out of sheer terror [רש״י, מצודות, ביאור שטיינזלץ]. Others see a more physical retreat, suggesting the Assyrian king will flee past his own towers, fortresses, and borders. In his panic, he will not even stop to seek shelter behind his own defenses, completely losing faith in their ability to protect him [רד״ק, אבן עזרא, שד״ל]. A distinct perspective suggests a physical destruction of these defenses, where the fortresses themselves will be split and cut in half, as though a giant saw had sliced through them [מלבי״ם].

This panic extends to the highest ranks of the military. The Assyrian officers, who once proudly raised their banners for war, will be utterly broken by fear. Most commentators explain that this dread will be triggered by the mere sight of a military flag; whenever these officers spot an enemy banner in the distance, they will be overcome with terror [מצודות, רד״ק, שד״ל, ביאור שטיינזלץ, אבן עזרא, מלבי״ם]. Alternatively, their panic is driven by the supernatural, as they witness the sheer magnitude of the miracles God performs for Israel [רש״י].

At the heart of this victory is the source of Jerusalem's enduring power, taking the form of a blazing flame and a roaring furnace. The primary approach among commentators is that this represents a divine fire of destruction, prepared specifically by God to consume the Assyrian camp that dared to besiege the city [רש״י, מצודות, רד״ק, ביאור שטיינזלץ, אבן עזרא]. This dual imagery of light and heat serves a double purpose: the very same light that illuminates and protects the righteous in Zion transforms into a deadly furnace to burn the wicked forces of the enemy [שד״ל, מלבי״ם]. Finally, this fire is deeply connected to the Temple service, hinting at the continuous flame burning upon the altar on the Temple Mount. The miraculous victory occurs in honor of this altar, serving as a powerful reminder that God maintains a permanent home in Jerusalem, ensuring the city's ultimate protection [רד״ק, אבן עזרא, שד״ל, ביאור שטיינזלץ].