Homing pigeons have long played an important role in war. Due to their homing ability, speed, and altitude, they were often used as military messengers. Carrier pigeons of the Racing Homer breed were used to carry messages in World War I and World War II, and 32 such pigeons were presented with the Dickin Medal. Medals such as the Croix de Guerre, awarded to Cher Ami, and the Dickin Medal awarded to the pigeons G.I. Joe and Paddy, amongst 32 others, have been awarded to pigeons for their services in saving human lives.
During World War I and World War II, carrier pigeons were used to transport messages back to their home coop behind the lines. When they landed, wires in the coop would sound a bell or buzzer and a soldier of the Signal Corps would know a message had arrived. The soldier would go to the coop, remove the message from the canister, and send it to its destination by telegraph, field phone, or personal messenger.
A carrier pigeon's job was dangerous. Nearby, enemy soldiers often tried to shoot down pigeons, knowing that released birds were carrying important messages. Some of these pigeons became quite famous amongst the infantrymen for whom they worked. One pigeon, named “Spike”, flew 52 missions without receiving a single wound. Another, named Cher Ami, lost his foot and one eye, but his message got through, saving a large group of surrounded American infantrymen.
Before the advent of radio, carrier pigeons were frequently used on the battlefield as a means for a mobile force to communicate with a stationary headquarters. In the sixth century BC, Cyrus, king of Persia, used carrier pigeons to communicate with various parts of his empire. In Ancient Rome, Julius Caesar used pigeons to send messages to the territory of Gaul.
During the 19th-century (1870–71) Franco-Prussian War, besieged Parisians used carrier pigeons to transmit messages outside the city; in response, the besieging Prussian Army employed hawks to hunt the pigeons. The French military used balloons to transport homing pigeons past enemy lines.