18 The Israelites went up to Bethela and inquired of God. They said, “Who of us is to go up first to fight against the Benjamites?” The LORD replied, “Judah shall go first.”

Read Judges 20:18 Using Other Translations

And the children of Israel arose, and went up to the house of God, and asked counsel of God, and said, Which of us shall go up first to the battle against the children of Benjamin? And the LORD said, Judah shall go up first.
The people of Israel arose and went up to Bethel and inquired of God, "Who shall go up first for us to fight against the people of Benjamin?" And the LORD said, "Judah shall go up first."
Before the battle the Israelites went to Bethel and asked God, “Which tribe should go first to attack the people of Benjamin?” The LORD answered, “Judah is to go first.”