Recent searches over the area abandoned by the Japanese at Kiska, as
indicated from American sources, have resulted in the location of many hand
grenades Type 91*, with attachment on the base, permitting grenade to be fired
from the Model 89 grenade thrower. Gun ammunition for the 13-mm machine gun
having almost the same dimensions as our 50-mm caliber, was also recovered. What
was described as a new lighter and smaller type grenade with no serrations
being of the concussion type also was found. The oldest among these had a date
of manufacture of August 1942.
Model 93 land mines at one particular spot were laid so that each mine was
wired upside down and connected to a can containing 30 blocks of TNT. This
method was said to increase the explosive force three or four times, and enlarged
thereby the danger area.
The Model 91 (1931) hand grenade can be either thrown or fired from the
Model 89 grenade discharger. It can also be modified for use as a rifle grenade
by substituting a tubular tail fin assembly for the propelling charge. This type
can be recognized by the serrated black body, the brass safety cover and the
perforated shell propelling charge screwed to the base.
The Model 97 hand grenade is believed to be carried by all Japanese front-line
troops. This type hand grenade is easily recognized by its serrated black body
as well as its brass fuze, which is identical with the fuze on the Model 91. The
Model 97 can be used as a booby trap by pulling the safety pin and placing it under
planks, chair seats, or the like. The weight of a man on the fuze is sufficient to
*The Type 91 is practically identical with the Type 97 except that the latter has
no propellant charge container.