31 The Benjamites came out to meet them and were drawn away from the city. They began to inflict casualties on the Israelites as before, so that about thirty men fell in the open field and on the roads—the one leading to Bethel and the other to Gibeah.

Read Judges 20:31 Using Other Translations

And the children of Benjamin went out against the people, and were drawn away from the city; and they began to smite of the people, and kill, as at other times, in the highways, of which one goeth up to the house of God, and the other to Gibeah in the field, about thirty men of Israel.
And the people of Benjamin went out against the people and were drawn away from the city. And as at other times they began to strike and kill some of the people in the highways, one of which goes up to Bethel and the other to Gibeah, and in the open country, about thirty men of Israel.
When the men of Benjamin came out to attack, they were drawn away from the town. And as they had done before, they began to kill the Israelites. About thirty Israelites died in the open fields and along the roads, one leading to Bethel and the other leading back to Gibeah.