3 Because he had nine hundred chariots fitted with iron and had cruelly oppressed the Israelites for twenty years, they cried to the LORD for help.

Read Judges 4:3 Using Other Translations

And the children of Israel cried unto the LORD: for he had nine hundred chariots of iron; and twenty years he mightily oppressed the children of Israel.
Then the people of Israel cried out to the LORD for help, for he had chariots of iron and he oppressed the people of Israel cruelly for twenty years.
Sisera, who had 900 iron chariots, ruthlessly oppressed the Israelites for twenty years. Then the people of Israel cried out to the LORD for help.