By reason of the abundance of his horses their dust shall
cover thee
The dust raised by the feet of the horses so numerous, should rise in such quantities, and to such a height, as to be like a cloud, which should cover the city; an hyperbolical way of speaking, as Kimchi observes; as is also the following clause: thy walls shall shake at the noise of the horsemen, and of the wheels,
and of the chariots;
at the shouts of the horsemen upon every attack, and the rattling of the chariot wheels running to and fro, in carrying on their designs: when ye shall enter into thy gates;
that is, then particularly shall such a shout be made by the horsemen, and such rattling of the chariots, as will even make the walls of the city to shake; an excess of expression, signifying the prodigious noise made at their entrance into it: as men enter into a city wherein is made a breach; or, "according to the entrance of a city broken up" F9; when its walls are broken down, and a gap is made; at which men rush in in great numbers, and with great force and clamour.