United States soldiers fortify the United States Mexico border

MS a supply train is unloaded by American soldiers in a dusty area with a two mule team at the lower left / Pan right of a large camp with American soldiers / MS a man in a suit adjusts his shoe and lights a cigarette in a dusty area with telephone telegraph poles in the distance / MS rows of barbed wire defenses at Douglas Arizona Aqua Pieta border / MS two men use pickaxes to dig as others look on / MS a man walks behind three other standing on a railroad trestle with mountains in the distance / MS two rows of men riding mules with a ditch at the right