The divine attributes. According to Cambridge.org, “The Divine Attributes explores the traditional theistic concept of God as the most perfect being possible.” The Divine Attributes are personhood, transcendence, immanence, omnipresence, omniscience, omnipotence, perfect goodness, unity, simplicity and necessity. According to Wikipedia, “The attributes of God are specific characteristics of God discussed in Christian theology. Christians are not monolithic in their understanding of God’s attributes.”
The just-war theory. According to Internet Encyclopedia of Philosophy, “Just war theory deals with the justification of how and why wars are fought… The principles of the justice of war are commonly held to be: having just cause, being a last resort, being declared by a proper authority, possessing right intention, having a reasonable chance of success, and the end being proportional to the means used.” So the just-war theory justifies why and how wars were fought, or at least deals with it.