The Type 1 Ho-Ni I was a tank destroyer developed by the Imperial Japanese Army for use during World War II in the Pacific theater.After the start of the Pacific War, units of the Imperial Japanese Army began to encounter advanced Allied medium tanks, such as the M4 Sherman. The Japanese Type 97 Chi-Ha main battle tank lacked sufficient armor or armament to deal with this threat, and work was begun on a tank destroyer version.The Type 1 Ho-Ni I was developed by utilizing the existing Type 97 chassis and engine, and replacing the gun turret with a 75 mm Type 90 Field Gun mounted in an open casemate with frontal and side armour only, which made it very vulnerable in close combat. The Type 1 Ho-Ni I was designed to operate as self-propelled artillery in the armored divisions. The design had no provision for machine guns, and although looking very similar to early German Panzerjäger tank destroyers, the Type 1 Ho-Ni I was designed to operate at ranges of up to 12,000 meters.