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Interior view of the commemorative monument of the Bayonet Trench at Douaumont, showing an underground passage supported by pillars, with a small central monument. On the reverse, printed text recalling the battles of the 1st Battalion of the 13th Infantry, and a handwritten address to Robert Martaud in Sancy, with a 25 centimes postal stamp and cancellation 'VERDON ET SES CHAMPS DE BATAILLE'.