World War II: Electronics and the U.S. Navy Magnetic mines, acoustical and homing torpedoes, and proximity fuzes

War is a killing game that is brought to its highest playing efficiency by the scientific researchers, engineers, and technicians of all major powers. Although some of the devices and techniques were developed in peacetime, the majority of the weapons systems were evolved in wartime crash programs, usually in response to new and advanced devices used by an enemy. Thus, with the advent of each new weapon, an equally important task had to be accomplished¿ that of finding an effective countermeasure.