This article provides insight into how, during the First World War, the ICRC handled the oversight of the respect of the 1906 Convention on the Wounded and Sick and the 1907 Hague Convention on Maritime Warfare, steadfastly working to uphold the law. It examines the ICRC's view on the applicability of the Conventions, describes its handling of accusations of violations of international humanitarian law and, finally, shows how the ICRC engaged in a legal dialogue with States on the interpretation of various provisions in the 1906 Convention.