Judges 20:22

And the people the men of Israel encouraged themselves, and set their battle again in array in the place where they put themselves in array the first day.

Cross-reference

Judges 20:15 gives the size of Benjamin's army (26,000) — contextual numbers for the battle the Israelites are regrouping for in this verse.

Judges 20:17 gives Israel's total army (400,000) — the force that encourages itself after defeat in this verse.