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Peace does not offer such an obvious rationale for arming oneself as does war. In fact, war expresses an intention to attack which fuels preparation for it via arming oneself. Yet, there are reasons to arm for peace especially when war is modeled only as a potential outcome. Potential wars could be stylized into a winner-takes-all (-that-is-left) contest. The contest design formalizes strategic behavior of, for simplicity, two players such as nations or states. These players set out to make two decisions: First, they decide the degree of arming and then, observe the armaments. Second, they decide on whether or not to use force. Two different mutual deterrence-concepts lead to armed, peaceful equilibria with certainty. Yet another better established concept considers arming to serve a different purpose, namely, to reinforce bargaining power.