Antipus is the military mind here. While the information comes form Helaman, it is more likely that the strategic planning came from Antipus. One of the things Antipus hoped was that the Lamanites would attempt to bypass Judea and strike as a lesser city downriver. Antipus kept spies watching for such a move because he wanted to take advantage of that movement and fall in upon the Lamanites from the rear. The Lamanites are learning the dangers of such movements, however, and they do not take that route.