There is so much unhelpful, non-biblical material readily available concerning spiritual warfare. In these two messages, David Powlison brings much needed clarity and balance to this very neglected theme (with pdf notes):

Power Encounters: Reclaiming Spiritual Warfare Part 1

https://ibcd.org/power-encounters-reclaiming-spiritual-warfare-part-1/   ‘

pdf notes: https://ibcd.org/wp-content/uploads/2017/01/Powlison-Power-Encounters-1.pdf

Power Encounters: Reclaiming Spiritual Warfare Part 2

https://ibcd.org/power-encounters-reclaiming-spiritual-warfare-part-2/  

pdf notes: https://ibcd.org/wp-content/uploads/2017/01/Powlison-Power-Encounters-2.pdf