Like the noise of chariots on the tops of the mountains do they leap, like the noise of a flame of fire that devoureth the stubble, as a strong people set in battle array.
Chariots is right, not saddles; the noise of chariots leaping on mountains fits the Prophet's meaning. Joel piles up images to stir the Jews from their stupor: the Assyrians are a consuming flame, the Jews are mere stubble they think themselves strong, but they are not.
AI summary
The locusts' heads resemble horses closely, a fact observers have long noted. Their springing motion roars like war chariots on rough roads; their devouring crackles like fire on stubble. The nations see this army of God approach and their faces go pale with terror.
AI summary
Commenting on Joel 2:4-6
Locusts leap by nature; their hind legs are longest and strongest, made for springing. The rattling of chariots on rough mountain stones mimics that sound exactly, and some say the noise carries six miles. The comparison lifts the plague from mere pest to an army.
AI summary