Judges 1:19

19 aAnd the Lord was with Judah, and he took possession of the bhill country, but he could not drive out the inhabitants of the plain because they had cchariots of iron.

Judges 4:3

3Then the people of Israel dcried out to the Lord for help, for he had e900 chariots of iron and he oppressed the people of Israel cruelly for twenty years.

Judges 4:13

13Sisera called out all his chariots, f900 chariots of iron, and all the men who were with him, from Harosheth-hagoyim to the river Kishon.
Copyright information for ESV