A firsthand narrative recounts a military mission into Tibet, outlining the political causes, the overland advance, and major phases of the campaign. The author records landscape and climate, frontier valleys and mountain passes, the hardships of transport and animal strain, and combat episodes including the Hot Springs engagement and troubles at Gyantse, leading to entry into Lhasa. The book combines battle description, logistical detail, sketches of Tibetan society and religious sites, and reflections on diplomacy, endurance, and the practical challenges of operations at high altitude.