This is from a psalm sing at Christ Church–The Son of God Goes Forth to War, with band, choir, and the whole congregation.
We are authorized and exhorted to make war on spiritual wickedness: but the weapons of our warfare are spiritual, not fleshly. Believe in God. Testify for Jesus Christ. Speak the truth and never, never let the enemy compel you to speak lies. Pray harder. Sing louder. Our Lord is coming, and not all the devices of this fallen world will hold Him back.