(Exodus 14:25) "And He removed their chariot wheels": R. Yehudah says: Because of the fire on high, the wheels below were broken, the yokes and the chariots ran of themselves, being filled with vessels of silver and gold and precious gems and pearls for Israel to take as spoil.
Pharaoh's Army Had Ridden to Battle in Extraordinary Wealth, and Now
Mekhilta Tractate Vayehi Beshalach 6:14