Daniel Whittle, a major in the Civil War, shares his insights into spiritual warfare. He challenges the reader to the trumpet of the Gospel. He begins with realizing the necessity to be born again by the Holy Spirit for warfare to be possible. He explains that Satan is a real person and is deceptive, and to use the Word of God to overcome him. Being dead to sin, he explains, is being dead to God's judgment, in relation to God's Law of sin, but spiritual warfare still exists. A quote from the book: "The Holy Spirit in regeneration is not to change the nature of the flesh at all; but to implant a new nature-Christ formed within by the Holy Spirit, in the power of which the believer does indeed deny the flesh, and is no longer living as minding the flesh. But the flesh is still there, unchangeably evil in its nature, with no improvement to be looked for in it.."