19:1-19 David's wars. - The history is here repeated which we read 2Sa 10. The only safety of sinners consists in submitting to the Lord, seeking peace with him, and becoming his servants. Let us assist each other in a good cause; but let us fear lest, while made instruments of good to others, we should come short of salvation, through unbelief and sin.
9-15. children of Ammon … put the battle in array before the gate of the city—that is, outside the walls of Medeba, a frontier town on the Arnon.
the kings that were come were by themselves in the field—The Israelitish army being thus beset by the Ammonites in front, and by the Syrian auxiliaries behind, Joab resolved to attack the latter (the more numerous and formidable host), while he directed his brother Abishai, with a suitable detachment, to attack the Ammonites. Joab's address before the engagement displays the faith and piety that became a commander of the Hebrew people. The mercenaries being defeated, the courage of the Ammonites failed; so that, taking flight, they entrenched themselves within the fortified walls.