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Wounds ascribed to the mortar at Bougainville in many instances were actually produced by the grenade discharger. Mistakenly called the knee mortar, this weapon, because of its accuracy and efficiency, had earned the respect of the American combat troops and was more feared than any other Japanese weapon. If the "knee mortar" was grouped with the other types of captured mortars, it was found to constitute approximately 90 percent of the total. Among the conventional mortar types, the ratio of the 81 mm. to the 90 mm. was about 3 to 2. A total of 96 mortars were captured, only one of which was the 90 mm. Model 97 (1937).