There is a clear lack in the Church of England of a coherent and thought through treatment of evil and the devil within the texts which the Church of England traditionally identifies as the repositories of doctrine. Focusing on initiation, healing and deliverence liturgies within the church, "Fight Valiantly" seeks to rectify that defecit, considering the Church of England's liturgical practice in the parishes, and highlighting the present danger of worshippers receiving an inconsistent and potentially incoherent account of the relationship with evil.

Newman examines why this high profile group of Royalists took the risks they did and explores how their role in the Civil Wars is an important key to our understanding of the wider questions of Royalist ideology and allegiance.