Spiritual warfare is the conflict which exists between the devil and his agents and God and His supporters. In Revelation 12:7–9,
Spiritual warfare is the Christian concept of fighting against the work of preternatural evil forces. It is based on the biblical belief in evil spirits, or demons, that are said to intervene in human affairs in various ways.
Imagery of spiritual warfare is displayed in the Book of Revelation when after the War in Heaven (Rev. 12:7), the beasts and kings of the earth wage war against God’s people (Rev. 19:19), and a final battle ensues with Satan and the nations of the earth against God himself (Rev. 20:8).