This thesis aims to contribute to the scholarship of International Relations (IR) by researching the processes that lie at the heart of military interventions and their legitimization through the lens of securitization theory. Focusing on the case of the French operations Serval and Barkhane in Sahel. This study builds on the contention that securitization is best applicable to military interventions in the form of a sequential model that distinguish three steps: the stage of identification, the stage of mobilization and the stage of desecuritization. Coupled with a qualitative content analysis it becomes a redoubtable tool to uncover the construction of legitimization.