The Israelites Punish the Benjamites

1 Then all Israel from Dan to Beersheba and from the land of Gilead came together as one and assembled before the LORD in Mizpah.

Read Judges 20:1 Using Other Translations

Then all the children of Israel went out, and the congregation was gathered together as one man, from Dan even to Beersheba, with the land of Gilead, unto the LORD in Mizpeh.
Then all the people of Israel came out, from Dan to Beersheba, including the land of Gilead, and the congregation assembled as one man to the LORD at Mizpah.
Then all the Israelites were united as one man, from Dan in the north to Beersheba in the south, including those from across the Jordan in the land of Gilead. The entire community assembled in the presence of the LORD at Mizpah.