In Ephesians 6:18, Paul has completed the metaphor of Roman armor. But he is not finished teaching about spiritual warfare. In fact, he has come to the most important weapon in our spiritual arsenal. Prayer is the heavy artillery. Through prayer we call down the bombardment of God against our adversary. In movies of World War II and the Viet Nam War, you have observed scenes when the adversary was about to break through the defenses and annihilate the good guys. The field commander would get on the radio and call in a bombardment of artillery or air defense. The bombardment would decimate the adversary and save the soldiers. Prayer is calling in the big guns of God for our defense. This is part of the arsenal we use for spiritual warfare.
Included in Richard Tow's sermon entitled "Ready for Anything (Part 4: Going on the Offensive)."