Warriors are warriors in their heart first. One has to believe in what he is fighting for. He, like King David must from deep within ask himself the question, "Is there not a cause?" When the answer to that question is settled then the want to and how to can be found.
God has called us into battle. He never promised us easy victory but instead promised us adversity and trials. If we have accepted Jesus as our Lord and Savior then we have accepted all that goes with that. Yes, we know the war is won but many battles are yet to be fought.
Each day as you arise to a new horizon of friend or foe, you can read your battle plans and get your strategy from the Word of God and those that have fought before you.
Never give up. Never give in. We are more than victorious through Christ our Savior.