Read 2 Samuel 2:24 Using Other Translations
Joab also and Abishai pursued after Abner: and the sun went down when they were come to the hill of Ammah, that lieth before Giah by the way of the wilderness of Gibeon.
But Joab and Abishai pursued Abner. And as the sun was going down they came to the hill of Ammah, which lies before Giah on the way to the wilderness of Gibeon.
When Joab and Abishai found out what had happened, they set out after Abner. The sun was just going down as they arrived at the hill of Ammah near Giah, along the road to the wilderness of Gibeon.