The Need for Deliverance is manifested by an inability to be free from a bondage : mental(emotional), physical or spiritual normally associated with demon activity. The problem could be in the form of compulsive impulses, over indulgence, perverted behavior, or other unacceptable life styles. A general or specific inability to even repent of sin and receive Christ in salvation or to repent of backsliding, may be seen.
Our warfare is with the forces of evil (Eph. 6:12). Our armor is truth,righteousness, preparation to witness the Gospell, faith, salvation. Our weapon is the Word of God. The battle is one involveing prayer (Eph. 6:14-18). Our authority and power is from Jesus Himself(Mark 16:17, Acts 1:8). The battlefield is first of all in the spiritual realms.