In 1923 the arsenal began making a Type 12 infantry gun, with a maximum range of 5,000 meters. In 1925, they began making a Type 14 infantry howitzer. Both were designed for mountain warfare. They also were able to set up production of copies of a German 105 mm heavy mountain gun and 88 mm field gun. When the war with Japan began they had produced 24 heavy mountain guns and 24 field guns to replace the heavy losses during combat to the Japanese forces.