You're that certain they won't overwhelm you with their numbers? That you won't eventually run out of ammo, food, or fuel and be taken down?
Well, at the very least, you go down fighting and take some of them with you.
And make your peace with God first. Eternity is a long time and if you are right with God, even if they kill you, they have taken nothing of value from you and you will be out of their reach forever. You won’t have to worry about encountering them where they are going.