13 And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;
14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
Thus, in order to use our God-given whole armour of God to win the spiritual battle, we need to mind the strategic pillar which is the Gospel. Obviously, the message of the cross of Jesus Christ is our strategic pillar as believers.
Also, as an army of God, you should always be ready for counterattack from devil. 1 Peter 5:8 says Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour:
Jesus Christ invaded and plundered the camp of the enemy, giving us eternal supernatural breakthrough. Thus, we are called to enforce the breakthrough already completed by Jesus on the cross of Calvary.
2 Corinthians 2:14 Now thanks be unto God, which always causeth us to triumph in Christ, and maketh manifest the savour of his knowledge by us in every place.
Watch the full message for details.