This short series aims to explore the Bible’s use of the imagery of a Roman triumph. The New Testament twice employs the Greek word ‘thriambeuo’ - meaning ‘to lead in a triumphal procession’. We’d like to view the big picture of the progress of Christianity in strategic terms as a triumphal procession through the world, and across the pages of history. In this fourth and final episode, Brian Johnston looks at "triumphing over angels".