After the year was expired - The next spring after the escape of the Ammonites into their city 2 Samuel 10:14.
The children of Ammon - The marginal reference supplies the word “the land of,” which is obviously the right reading.
David tarried at Jerusalem - The Syrians being subdued, the war with Ammon was not of sufficient moment to require David’s personal presence. The whole section relating to David’s adultery and Uriah’s death, from this verse to 2 Samuel 12:26, is omitted in the Book of Chronicles.