Another tradition behind Tu B'Av follows one of the darkest episodes in the Book of Judges. After the horrific abuse and murder of a Levite's concubine in Gibeah, the tribe of Benjamin refused to hand over the guilty men, triggering a devastating civil war. When the fighting ended, only 600 Benjaminite men remained alive. In their anger, the other tribes had sworn never to give their daughters in marriage to Benjamin, leaving the tribe on the brink of extinction.
The elders searched for a way to save Benjamin without breaking their oath. As the annual grape harvest festival approached in Shiloh, in the neighboring territory of Ephraim, they instructed the surviving Benjaminites to hide in the vineyards. When the young women came out to dance, the men emerged and took wives for themselves, technically avoiding the wording of the vow.
According to the Talmud (Ta'anit 30b), this reconciliation took place on Tu B'Av. The tribe of Benjamin was saved, and the fractured nation could begin to heal.

Dancing in White
By the Second Temple period, Tu B'Av had become one of the happiest days of the Jewish year. Under the light of the midsummer full moon, unmarried women gathered to dance in the vineyards around Jerusalem, while young men came in search of a bride.
The Mishnah describes a remarkable custom: every woman wore a borrowed white dress. The wealthy borrowed from the poor, and even the daughters of prominent families wore borrowed garments, ensuring that no one was embarrassed or judged by her clothing. The focus was not on wealth or social status, but on character. To this day, Tu B'Av celebrates a love that transcends appearances and heals divisions.