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Colonel Marie Augstin Gaston Cros (known as Gaston Cros) (6 October 1861 – 10 May 1915) was a French army officer and archaeologist. He was born in Alsace and was displaced when that territory was incorporated into the German Empire. He joined the French Army as a lieutenant and saw action in Tonkin before spending several years surveying in Tunisia, receiving the honours of membership of Vietnamese and Tunisian orders and appointment as a chevalier of the Legion of Honour. In 1901 Cros was appointed head of the French archaeological expedition to Girsu, Iraq to continue the work of Ernest de Sarzec. His work over the next five years included the tracing of the 32.5 feet (9.9 m) thick city wall and for his work there received a letter of commendation from Gaston Doumergue, the Minister of Fine Arts, and the award of the Golden Palms of the Ordre des Palmes Académiques. Promoted to lieutenant-colonel, Cros served in the French protectorate of Morocco from 1913, seeing action in the Zaian War.
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 Battle of the Yser and the Second Battle of Artois. It was at Artois that he was killed in a German counter-attack. Cros' name is recorded alongside that of Colonel Pein, who commanded the 1st Moroccan Brigade at Artois, on the Moroccan Division Memorial at Vimy.