Father God: I'm young and inexperienced, and I can't see that I would be much help to you in a battle. But I will trust in your strength and take on your power. I will invite you to fill me with your Holy Spirit. I'm weak, Lord, but you are strong. I am might in you.
Amen

Take all help you can get, every weapon God has issued, so that when it's all over but the shouting you'll still be on your feet. - Ephesians 6:13