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The Sound of Drums
Since the beginning of warfare leaders needed to be able to communicate with their troops from a distance. To get their commands heared through the din of battle. during the roar of battle. In many places in the world, the drum has always been one of the most favored methods of battlefield communication.
Drums would be used to men where to gather, and when to attack. When to leave the battlefield and when to curfew had fallen on the camp. From a distance, units could communicate with other to coordinate. Drums would also help the soldiers keep their pace when marching.
Since our military heritage is drawn mainly from European tradition, it is interesting to note that prior to the Crusades, drums were not used in European armies. In fact, when facing off against the forces of Islam, who made heavy use of large kettledrums to command the troops, they found that their horses reacted poorly to the noise to which they had never heard. Early battles were heavily affected by the enemies drums until they grew accustomed.
Returning armies worked the drums into their operations. By the time that the European powers came to the American continent, they found themselves up against indigenous people that had been using drums for communication for thousands of years.
Drums, bugles and other musical instruments found their way into the US military. They only started to fade from use during the Civil War when the telegraph began taking its place in the command and control realm. Eventually, the radio would provide the most direct communication method and the drums fell silent as a battlefield tool.