At the outbreak of World War II in 1939, Switzerland immediately began to mobilize for a possible invasion. The transition into wartime was smooth and caused less controversy than in 1914; the country was fully mobilized in only three days. Parliament quickly selected the 61-year-old career soldier Henri Guisan to be General and by 3 September 430,000 combat troops and 210,000 in support services, 10,000 of whom were women, had been mobilized, though most of these were sent home during the Phoney War. At its highest point, 850,000 soldiers were mobilized.