The author surveys the Royal Navy's strategic and practical contributions during the First World War, tracing how naval command, fleet deployments and control of sea lanes underpinned allied operations. Chapters examine the concentration of sea power, operations to clear oceans and the Mediterranean, responses to submarine and mine threats, convoy and transport duties, the emergence of naval aviation, and the character and training of officers and sailors. Illustrations and maps accompany discussions of tactics, logistics, inter-allied cooperation, and the role of maritime superiority in supporting land campaigns and safeguarding commerce.