Paul turns from the battle cry in Ephesians 6:10 to the battle plan in Ephesians 6:11, 13. We must not only prepare ourselves for battle by becoming strong, we must also protect ourselves in battle by having a plan.

The battle plan has three parts. 
1. We must put on the armor of God, 
2. Stand our ground, and 
3. Watch out for traps laid by the devil.