This article wants to come to a biblical-theological perspective on war and peace. It starts by looking at Yahweh as a warrior God and war as a theme in the Old Testament. The impact of the teaching and person of Jesus Christ, who brought a new relationship between Israel and the nations, is considered next. Then follows a consideration of the early church's view of the Christian as a citizen of two "kingdoms" or "communities." Next, it notes the contributions of some modern theologians on the topic. Finally, the most important aspects of a Christian doctrine of peace is reflected upon.