Above all, taking the shield of faith, wherewith ye
shall be able to quench all the fiery darts of the wicked.
(Eph. 6:16)

Here is a video depicting warfare by arrows in ancient days. The apostle Paul gives us insight into the sometimes-constant battle against the mind. The thoughts that the enemy bombards us with is similar to the warfare fought in this video. Knowing the word of God and having faith in God are both sword and shield used to come away from the battlefield victorious!