"For Blood and Empire" is a historical analysis by J. A. Mangan that explores the relationship between British imperialism and the sport of rugby. The book examines how rugby was used as a tool for promoting national identity and imperial values during the late 19th and early 20th centuries. Mangan discusses the cultural significance of rugby in the context of British colonialism, highlighting how the sport served to reinforce social hierarchies and foster a sense of unity among the British elite. The work provides insights into the interplay between sports, politics, and identity in the era of empire.