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Systems of systems (SoS) are built as a collection of systems capable of fulfilling their own function, as well as contributing to other functionalities. They are expected to increase production efficiency and possibly decrease human involvement in harmful environments, and in many cases such systems are safety-critical. For SoS it is a paramount to provide both safety and security assurance. It is not sufficient to analyze and provide assurance of these properties independently due to their mutual connection. Hence, a joint effort addressing safety and security that provides joint guarantees on both properties, is required. In this paper we provide a safety and security assurance argument by incorporating an adversary point of view, and identify potential failures coming from the security domain that might lead to an already identified set of hazards. In this way system assets, vulnerabilities and ways to exploit them can be assessed. As an outcome mitigation strategies coming from security considerations can be captured by the safety requirements. The approach is illustrated on an autonomous quarry.