Overall, three general mobilisations have been declared to ensure the integrity and neutrality of Switzerland. The first one was held on the occasion of the Franco-Prussian War of 1870–71. The second was in response to the outbreak of the First World War in August 1914. The third mobilisation of the army took place in September 1939 in response to the German attack on Poland; Henri Guisan was elected as the General-in-Chief.