This paper focuses on the applicability of general international law principles and instruments to European Union (EU) peace missions (also known as crisis management operations). First, the paper shall address the legal framework applicable to EU peace missions, including general principles and instruments of international human rights and humanitarian law. Subsequently, the focus will shift to difficulties which arise in this regard, before providing some concluding remarks. Evidently, in view of the nature of peace missions, the most relevant general principles and instruments applicable are those pertaining to international human rights and international humanitarian law. Although not discussed here, general principles applying to internally displaced persons (IDPs) are also relevant.