2 Samuel 2:12,13

Abner and the servants of Ish-bosheth went out to Gibeon They passed over Jordan into the country of Benjamin, where Gibeon was, (Joshua 18:25,) to fight with Judah, and to bring them into subjection to Saul's son. It ought to be remarked, that David did not begin any hostility, but waited to see how God would dispose of things in his favour. And Joab and the servants of David went out To oppose the designs of the Israelites, Joab being the chief commander of David's forces. And met together by the pool of Gibeon Where the two opposite armies put themselves in a posture for battle.