What does Judges 3:15 mean?

But when the Israelites finally cried out to God for help, he raised up a rescuer for them: Ehud, the son of Gera, a left-handed man from the tribe of Benjamin. The Israelites sent Ehud to deliver their tribute to Eglon, king of Moab. Judges 3:15 - Modern Text Bible

(God responds to Israel's desperation by choosing an unlikely hero, Ehud, who is left-handed—a detail that will matter.)