New Defender's Study Bible Notes
8:4 seven hundred horsemen. I Chronicles 18:4 gives this number as “seven thousand horsemen.” The apparent discrepancy may be due to a copyist error, and most likely should be “seven thousand.” Both numbers could be correct, however, if the “seven hundred” were somehow regarded as an elite unit within the “seven thousand.”
8:4 houghed. See note on Joshua 11:6.
8:13 valley of salt. This probably refers to the Dead Sea region, and the “smiting” probably was in relation to the Edomites instead of the Syrians (see II Samuel 8:14; also I Chronicles 18:12). It is possible that the Syrians had sent a contingent to help the Edomites in their battles against Israel, and both had been defeated by David’s armies together.