The name of the Lord is a strong tower; the righteous run into it and are safe.
2 Corinthians 10:4
The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds.
Defense and Offense.
Old Testament and New Testament
The Lord protects me. The Lord gives me the tools to take the offensive.
My sword is the Spirit of the Lord, which is the Word of God. John saw Jesus, in His glory, with a sword coming out of His mouth.
My spiritual goal is to be more like Jesus. Therefore I need a sword coming out of my mouth.
I have been given authority to wield that sword. I can take down strongholds. I am expected to take down strongholds.
Those who run into the strong tower are non combatants. If I have armor and I have a sword then I stand outside the strong tower and defend the weaker ones who gather inside. Or, I may be at the front of the battle lines, tearing down the very gates of Hell.
My sword is the Word of God, that which was written long ago, (which is just as fresh and pertinent today) but it is also the inspired Word of God spoken today, to me, through others or directly.
The most powerful weapon I have to tear down strongholds is praying the Word of God in strength and confidence.