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Although a founding member of the European Union, Germany has been rather reluctant to assume a pre-eminent leadership role in the European military integration process, choosing to focus more on social and economic affairs. But following Brexit, Germany might be also called upon to act as an integration “engine” in the defence area. Using the case study method and the analysis of social documents, we argue that Germany’s high level of military integration allows this state to assume, alongside France, a leading role in the defence pursuits of the European Union.