This document is a beyānnāme, or declaration, sent by the Ottoman reʾīsül-kuttāb (chief scribe) to Britain's ambassador to the Ottoman Empire, justifying the Ottoman declaration of war on Russia by explaining Russia's violation of treaty obligations. The document gives insight into eighteenth-century Ottoman attitudes to international law and its relationship with Islamic law. Its use of the phrase naḳż-ı ʿahd (breaking the treaty), which has its origins in a specifically Qurʾānic context illustrates one way in which war was legitimized within the Ottoman Empire. Other phrases used in the beyānnāme demonstrate how Ottoman legal plurality functioned within a martial context.