Musar zu Schoftim 5:21

ויקח שש מאות רכב בחור וכל רכב מצרים. The Zohar asks if the 600 choice chariots were not also part of Egypt's cavalry that the Torah had to add the words "and all the chariots of Egypt?" The Zohar answers that the subject in this verse is Samael who took the chariots of other nations with him in the pursuit of the Israelites. G–d paid those people back when Sisera lost all his iron chariots in the battle against Barak and Deborah (Judges 5,20-21).