South Tibet
The official position of the British Government was it would not intervene between China and Tibet and would only recognize the "de facto" government of China within Tibet at this time. In his history of Tibet, Bell wrote that "the Tibetans were abandoned to Chinese aggression, an aggression for which the British Military Expedition to Lhasa and subsequent retreat [and consequent power vacuum within Tibet] were primarily responsible". Later, Britain defined the Indo-Tibetan border at the 1914 Simla Accord with the McMahon Line. China's delegation refused to agree to the line and still claims the land India received from Tibet as South Tibet, although the McMahon line remains the de facto border.