2 Samuel 2:12-17

12Then Ner's son, Abner, left Mahanaim and he went to Gibeon. He took with him the men who served Saul's son, Ish-Bosheth.

13Zeruiah's son, Joab, took David's men to meet Abner's men at the pool of Gibeon. One group sat on one side of the pool while the other group sat on the other side.

14Then Abner said to Joab, ‘Some young men from each of our groups should fight against each other. Then we can watch them.’ Joab agreed.

15So they chose 12 men to fight on behalf of Benjamin and Ish-Bosheth. They also chose 12 of David's men to fight against them.

16As they fought, each man took hold of his enemy's head. And each man pushed his sword into his enemy's side. So they all fell down together and they were dead. So people called that place ‘The Field of Swords’. It is in Gibeon.

17That day, the two groups fought a great battle against each other. David's men won the fight against Abner and the men of Israel.