en_tn/1ch/18/03.md

David then defeated Hadadezer

Here David and Hadadezer are spoken of as if they were alone, but the reader should understand that these kings represent their armies that were with them. Alternate translation: "David and his army then defeated the army of Hadadezer" (See: rc://en/ta/man/translate/figs-metonymy)

Hadadezer

This is the name of a man. (See: rc://en/ta/man/translate/translate-names)

Zobah

This is the name of a country.

was traveling to establish his rule by the Euphrates River

"was going to the Euphrates river to conquer people in that area"