The use of dogs in battle dates back centuries. For example, Roman soldiers trained dogs and covered them with mail armor and spikes before sending them in columnns to attack members of the opposing forces. This tactic continued in various forms while commanders such as Napoleon used the dogs to alert him of enemy movements owing to their superior senses of smell and hearing. For example, Napoleon's used dogs as audible pickets, with their barks signaling the approach of a potential enemy soldier. Dogs were also placed inside buildings with sensitive materials to attack potential intruders.
The use of the dogs in battle continued throughout both World Wars and dogs are used in a variety of military operations in modern times. From detecting explosives and drugs to aiding those who have been mentally and physically wounded in the war, working dogs remain an important part of the U.S. Military.