Please read Ephesians 6:10-20
If you look at the whole armor of God, you will find out that there is nothing to protect your back. I believe there are two reasons for that. 1) There is no protection for those who decide to leave the war zone and backslide. 2) HE has your back. Look at what He did with Job, with the wall around Job that the devil could not touch. Also, He is a wall of fire all around His church (read Zechariah 2:5). Another observation is this: there is only one attack weapon (the sword which represent the Bible). Have you used your attack weapon recently to gain more souls and help get them out from the kingdom of the devil?