מִשִּׁפְעַ֥ת סוּסָ֖יו יְכַסֵּ֣ךְ אֲבָקָ֑ם מִקּוֹל֩ פָּרַ֨שׁ וְגַלְגַּ֜ל וָרֶ֗כֶב תִּרְעַ֙שְׁנָה֙ חֽוֹמוֹתַ֔יִךְ בְּבֹאוֹ֙ בִּשְׁעָרַ֔יִךְ כִּמְבוֹאֵ֖י עִ֥יר מְבֻקָּעָֽה׃
Karena banyaknya kuda-kudanya, debu yang diterbangkan mereka akan menutupi engkau. Tembok-tembokmu akan bergoncang oleh derap pasukan berkuda, roda, dan kereta perang, ketika ia masuk melalui pintu-pintu gerbangmu, seperti orang masuk ke kota yang temboknya telah ditembus.
Rashi
From the abundance of his horses When there are many horses, they raise dust with their feet, which ascends and becomes like a cloud, darkening the earth. This is called שִּׁפְּעַת, an abundance. Similarly, (Job 22:11): “or an abundance of (וְשִּׁפְּעַת) water covers you,” de la foison in French, of abundance.
Rashi
as men enter a breached city as they enter a city that has been breached of its wall(Targum), that its wall has been breached.