 Complete the following phrase:  Upon the outbreak of the First World War Cros was recalled to metropolitan France and fought in defence of Paris at the First Battle of the Marne, leading an ad hoc unit of zouaves and tirailleurs. He was wounded and spent two days directing his troops from a horse-drawn carriage before he was forced to leave his command. On 15 September 1914 he was promoted to colonel and subsequently received command of the 2nd Moroccan Brigade which he led at the 