The nineteenth century saw the British empire rapidly expand around the globe, with the British military facing conflicts in Spain, Crimea, India, Central Asia, and across the African continent. This rapid expansion culminated in the largest of Britain’s many nineteenth century colonial conflicts: the South African War (1899-1902), otherwise referred to as the Second Anglo-Boer War. While Britain had been engaging in military conflicts nearly continuously throughout much of the nineteenth century around the globe, its intelligence apparatus was, at both the strategic and the tactical levels, largely ad hoc and underfunded. Because of this, those in the British military tasked with gathering intelligence regularly relied upon nonmilitary people for intelligence. My research seeks to analyze the structure of British tactical intelligence networks during the South African War, focusing specifically on the British military’s often unacknowledged reliance on people it deemed outside of itself, such as volunteers, prisoners, journalists, and black South Africans to gather and communicate military intelligence. Drawing on primary sources such as newspapers, diaries, parliamentary testimony, and memoirs, I have crafted a view of British tactical intelligence networks during the conflict which focuses on the biases and prejudices which influenced their development and structure, as they simultaneously reified and questioned the dominant racist and sexist hierarchies of the time. I argue that the diverse composition of British tactical intelligence networks in South Africa demonstrates that these networks were intersectional spaces, where politics of race, sex, and knowledge determined the methods by which intelligence was gathered, communicated, and analyzed throughout the war. In contextualizing the tactical intelligence networks of the South African War as intersectional spaces, I seek to demonstrate that the study of intelligence networks in wars of imperial expansion affords a unique opportunity to analyze the relationship between colonial armies and the peoples they fight amongst.