Bat Bomb - Project Details

Project Details

By March 1943 a suitable species had been selected. The project was considered serious enough that Louis Fieser, the inventor of military napalm, designed 0.6 ounce (17 g) and one ounce (28 g) incendiary devices to be carried by the bats. A bat carrier similar to a bomb casing was designed that included 26 stacked trays, each containing compartments for 40 bats. The carriers would be dropped from 5,000 feet (1,525 m). Then the trays would separate but remain connected to a parachute that would deploy at 1,000 feet (305 m). It was envisioned that ten B-24 bombers flying from Alaska, each carrying a hundred shells packed with bomb-carrying bats could release 1,040,000 bat bombs over the target—the industrial cities of Osaka Bay. A series of tests to answer various operational questions were conducted. In one incident the Carlsbad Army Airfield Auxiliary Air Base 32°15′39″N 104°13′45″W / 32.26083°N 104.22917°W / 32.26083; -104.22917 near Carlsbad, New Mexico, was set on fire when armed bats were accidentally released. The bats incinerated the test range and roosted under a fuel tank. Following this setback, the project was relegated to the Navy in August 1943, who renamed it Project X-Ray, and then passed it to the Marine Corps that December. The Marine Corps moved operations to the Marine Corps Air Station at El Centro, California. After several experiments and operational adjustments, the definitive test was carried out on the "Japanese Village" a mockup of a Japanese city built by the Chemical Warfare Service at their Dugway Proving Grounds test site in Utah.

Observers at this test produced optimistic accounts. The chief of incendiary testing at Dugway wrote: “A reasonable number of destructive fires can be started in spite of the extremely small size of the units. The main advantage of the units would seem to be their placement within the enemy structures without the knowledge of the householder or fire watchers, thus allowing the fire to establish itself before being discovered.” The National Defense Research Committee (NDRC) observer stated: “It was concluded that X-Ray is an effective weapon.” The Chief Chemist’s report stated that on a weight basis X-Ray was more effective than the standard incendiary bombs in use at the time. “Expressed in another way, the regular bombs would give probably 167 to 400 fires per bomb load where X-Ray would give 3,625 to 4,748 fires”.

More tests were scheduled for the summer of 1944 but the program was cancelled by Fleet Admiral Ernest J. King when he heard that it would likely not be combat ready until mid-1945. By that time it was estimated that $2 million had been spent on the project. It is thought that development of the bat bomb was moving too slowly, and was overtaken in the race for a quick end to the war by the atomic bomb project.

Dr. Adams maintained that the bat bombs would have been effective without the devastating effects of the atomic bomb. He is quoted as having said:

The infamous "Invasion by Bats" project was afterwards referred to by Dr. Stanley P. Lovell, director of the Office of Strategic Services (OSS) as "Die Fledermaus Farce."