The middle of the twentieth century witnessed a serious border dispute between China and India. This article explores how these countries used multiple media (e.g., historical documents and film) to support their respective territorial claims. The two countries pursued similar authoritarian approaches by expanding their archival holdings, banning books, and selectively redrawing maps. They regarded dissenting views not only as incorrect but as national security threats. China and India policed domestic media to legitimize government policies and to present their cases to the international community. The British government, for its part, demonstrated its support for India. Because British leaders sympathized with their former colony and because the borders of India were a product of the British Empire, leaders in the United Kingdom endorsed Indian propaganda. Nevertheless, democracy in India and the United Kingdom rendered complete control of the media difficult. The Sino-Indian conflict therefore represented a war over information as well as territory.