What does Judges 20:28 mean?

and Phinehas, son of Eleazar and grandson of Aaron, was serving as priest.) They asked, 'Should we go out again to fight our relatives, the Benjaminites, or should we stop?' The Lord answered, 'Go. Tomorrow I’ll hand them over to you.' Judges 20:28 - Modern Text Bible

(With the priest Phinehas leading, Israel asks God one more time. This time, God promises victory the next day.)