Examining Russian military intelligence in the war with Japan of 1904-05, this book, based on newly-accessible documents from the tsarist era military, naval and diplomatic archives, gives an overview of the origins, structure and performance of Russian military intelligence in the Far East at the turn of the twentieth century, investigating developments in strategic and tactical military espionage, as well as combat renaissance. It provides a comprehensive reappraisal of the role of military intelligence in the years immediately preceding the First World War, by comparing the Russian military secret services to those of the other great powers, including Britain, Germany, France and Japan.