By reason of the abundance of his horses their dust shall cover thee: thy walls shall shake at the noise of the horsemen, and of the wheels, and of the chariots, when he shall enter into thy gates, as men enter into a city wherein is made a breach.
Because of the many horses he has, their dust will cover you. Your walls will shake from the noise of the riders, the wheels, and the chariots as they enter your city, like when people enter a city with a broken wall.