By reason of the abundance of his horses their dust
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.