2 Samuel 2:14-17

14Then Abner said to Joab, “Let’s have the young men get up and compete in front of us.” “Let them get up,” Joab replied.

15So they got up and were counted off — twelve for Benjamin and Ish-bosheth son of Saul, and twelve from David’s soldiers.

16Then each man grabbed his opponent by the head and thrust his sword into his opponent’s side so that they all died together. So this place, which is in Gibeon, is named Field of Blades.

17The battle that day was extremely fierce, and Abner and the men of Israel were defeated by David’s soldiers.