What does 2 Samuel 10:8 mean?

The Ammonites came out and lined up at the entrance to their city gate, while the Aramean mercenaries from Zobah and Rehob, and the men from Tob and Maacah, took their positions in the open fields. 2 Samuel 10:8 - Modern Text Bible

(The enemy splits into two groups: the Ammonites defend their city, and the hired soldiers prepare to fight in the open.)