What does Judges 20:15 mean?
The people of the tribe of Benjamin are demonstrating a startling, likely misplaced unity with the rapists and murderers of the city of Gibeah (Judges 19:14). The other eleven tribes have responded to a heinous atrocity (Judges 19:22–27) by massing troops nearby. Before attacking, the tribes call on Benjamin to join with them in punishing the evildoers (Judges 20:12). Gibeah, it seems, has prepared their own militia to resist any raids. Those forces number a few hundred, which is nothing compared to the massive force waiting in Mizpah (Judges 20:1–2).Rather than sending their soldiers into Gibeah, identifying those responsible for raping and murdering a concubine, and turning them over to be executed, the people of Benjamin bolster the militia and prepare for war. Even if the tribe of Benjamin agreed that the criminals needed to be held responsible, they seem completely opposed to the other tribes being involved.
The quantity of troops pulled together is 26 'eleph, a Hebrew term that can mean "thousand" or "clan" or "division" (Judges 6:15). The other eleven tribes have compiled 400 'eleph of men. Regardless of the exact number of people involved, the Benjaminites are drastically outnumbered.