2 Samuel 2:25

The children of Benjamin … became one troop. Benjamin was probably the only tribe that entered keenly into Ishbosheth's cause; for the maintenance of the kingdom in the family of Saul meant the continuance of that favouritism which had enriched them at the expense of the community ( 1 Samuel 22:7 ). They were, too, a very warlike tribe, and Abner was one of themselves, and probably, therefore, the main body of his army, and certainly his most trustworthy men, were Benjamites. Profiting by the delay caused by the halting of David's soldiers round tile body of the fallen Asahel, Abner had rallied his men, and posted them on the top of the hill, where they were prepared now to fight on more equal terms.