In World War I, carrier pigeons were crucial in relaying messages from the front to positions behind the lines.
The most renowned was Cher Ami - or Dear Friend - flown by the U.S. Army Signal Corps during the Battle of Verdun in France.
The message Cher Ami carried on October 4, 1918 was vital in saving hundreds of American soldiers of the now famed "Lost Battalion" of the 77th Infantry.
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