This book traces the environmental history of war and militarisation in France, from the creation of Chalons Camp in 1857 to military environmentalist policies in the twentieth century. It offers a fresh perspective on the well-known histories of the Franco-Prussian War, Western Front (1914-18), Second World War, Cold War and the anti-base campaign at Larzac, whilst uncovering the largely 'hidden' history of the numerous military bases and other installations that pepper the French countryside. Mobilising nature argues that the history of war and militarisation can only be fully understood if human and environmental histories are considered in tandem. Preparing for and conducting wars were only made possible through the active manipulation and mobilisation of topographies, climatic conditions, vegetation and animals.