warfare

What impact would it have had on the church in our late-modern, scientific day and age if the author(s) of the Apostles’ Creed had included a statement about the reality of angelic activity and spiritual warfare in the Christian life? I envision such a statement as reading like this: “I believe...

This was a post that was made on the board but the links provided were not working. I am looking for resources on Just War Theory particularly both Western and Eastern resources between the patristics through the 12/13th Century. Anything that you can provide may lead me in the right direction...