These two verses are a small sermon inserted by Mormon. Then purpose of telling of these wars is not just the war, but the demonstration of the will of the Lord on the side of right. Mormon makes certain that this is the message by making it explicit here. He gives the Lamanites their due as fighters, but notes the “Nephites were inspired by a better cause.” This will be a fierce battle, but the moral superiority of the Nephites is ultimately what carries the day. Moroni had a brilliant battle plan, and Mormon respectfully describes it, but in the end, Mormon credits not Moroni’s genius but the moral superiority of the cause. That is the real point of these military actions.