ישעיהו, פרק י׳, פסוק כ״ח

A vivid picture unfolds of an invading army making a rapid, unhindered march toward Jerusalem. The Assyrian forces sweep through the land, terrifying and easily conquering the cities in their path [שד״ל, ביאור שטיינזלץ]. This detailed geographical account illustrates the immense power of King Sennacherib and his frantic haste to reach Jerusalem in a single day [מצודת דוד]. At the same time, charting this path serves to magnify the greatness of the miracle that will soon take place through his sudden downfall [רש״י, שד״ל].

Beneath the surface of this terrifying advance lies a profound sense of mockery directed at the Assyrian king. While he charges forward with extreme overconfidence, Jerusalem is essentially laughing at him, as his ultimate defeat there is already predetermined [מלבי״ם, מצודת דוד]. The prophet tracks this doomed campaign by listing the specific places along the route [רש״י]. The invasion begins at Aiath, identified as the city of Ai on the northern border of the territory of Benjamin, before moving through the neighboring city of Migron [מלבי״ם, שד״ל]. Although some of these locations do not appear in earlier historical records, this is simply because certain cities were known by multiple names [רד״ק].

When the army reaches the city of Michmash, Sennacherib makes a significant tactical decision to store and leave behind the bulk of his heavy weapons along with part of his camp [רד״ק, מצודת ציון]. Commentators offer several complementary reasons for this move. Primarily, shedding the heavy equipment lightens the army's load, allowing them to advance toward Jerusalem with maximum speed [אבן עזרא, רד״ק, מצודת דוד]. Additionally, this action stems from pure arrogance; the king views the conquest of Jerusalem as such an easy task that he assumes his full arsenal is entirely unnecessary [רד״ק, מצודת דוד]. Beyond speed and pride, there is also a practical geographical constraint. The pass at Michmash forms a very narrow gorge between two rocks. By leaving the heavy gear behind under the watch of guards, the Assyrian army avoids severe delays while navigating the tight passage [שד״ל].