This chapter explores European influence on Ottoman captivity in the 1850s–1870s, through the humanitarian movement, including the Red Cross, and the codified law it spawned: the Geneva Convention and the Brussels Convention. Humanitarianism, during the Crimean War, led the Porte to end the wartime enslavement of civilians. But otherwise, it came to the Ottoman Empire during and after the Crimean War, as it did elsewhere, and helped Ottoman captives on the same terms as others. The Porte signed multilateral treaties at the same time as other states, and Ottoman captivity practices structurally resembled, though did not fulfil, the new rules. More importantly, during the 1877–78 Russo–Ottoman War, the Ottoman Empire came to use the language of European customary law—the Law of Nations—to defend its practices and assert its place. This was the first time the Porte did so with respect to captivity.