2 Samuel 21:15

Yet war again. This refers to another war that David had with the Philistines. The writer of Samuel is here giving a number of detached items of which the exact relationship to other events in David’s reign is not known. The incident evidently took place after David had been ruling for some time and was therefore quite advanced in years (v. 17). In 1 Chron. 20:4-8 the parallel account of these struggles with the Philistines, except the first, follows the account of Joab’s destruction of Rabbah of Ammon, which the writer of 2 Samuel places in ch. 12:26-31. The intervening items of 2 Samuel — namely, Ammon’s sin (ch. 13), the return of Absalom from Geshur (ch. 14), the revolts of Absalom (chs. 15–19) and Sheba (ch. 20) and the three-year famine (ch. 21:1–14) — are not found in Chronicles.