Matthew Henry Presbyterian @wholebiblehenry

Here, I. Abner, being conquered, meanly begs for a cessation of arms. He rallied the remains of his forces on the top of a hill (Sa2 2:25), as if he would have made head again, but becomes a humble supplicant to Joab for a little breathing-time, Sa2 2:26. He that was most forward to fight was the first that had enough of it.

Commenting on 2 Samuel 2:25-32

John Gill Reformed Baptist @doctorgill

So Joab blew a trumpet,.... Or caused one to be blown as a signal of a retreat: and all the people stood still, and pursued after Israel no more; as soon as they heard the trumpet sound, the meaning of which they understood, they stepped at once, and left off their pursuit: neither fought they any more; that day, and perhaps no pitched battle afterwards...

Keil & Delitzsch Lutheran @keilanddelitzsch

2Sa 2:27-28 Joab replied, “If thou hadst not spoken (i.e., challenged to single combat, 2Sa 2:14),the people would have gone away in the morning, every one from his brother,” i.e., there would have been no such fratricidal conflict at all. The first כּי introduces the substance of the oath, as in 1Sa 25:34; the second gives greater force to it (vid., Ewald, §330, b.).

Commenting on 2 Samuel 2:27-28