High Quality Content by WIKIPEDIA articles! The Type 3 Chi-Nu (?????, San-shiki chusensha?) was another improvement over the Type 97 Chi-Ha line of medium tanks of the Imperial Japanese Army in World War II. The Type 3 Chi-Nu mounted one Type 3 75 mm Tank Gun, one of the largest guns ever to be fitted on a World War II Japanese tank.Type 3 medium tank Chi-Nu was developed to cope with the American M4 Sherman [1] after it was clear that the Type 1 Chi-He design was still inadequate. The Army Technical Bureau had been working on the Type 4 Chi-To medium tank as the counter to the M4 Sherman, but there were problems and delays in the program, and as a result a stopgap tank was required. Development on the Type 3 Chi-Nu started in May 1943 and was finished by October, just six months later. The low priority given to tank production by 1943 meant that the Type 3 did not enter actually enter production until 1944, by which time raw materials were in very short supply, and much of Japan's industrial infrastructure had been destroyed by American bombing.