Two Type 96's of the 1st Artillery Battalion of the 4th Border Guard Unit was moved to Manchuria to Kotō Fortress to strengthen the Japanese defense in preparation for a Soviet attack. The Japanese army had eight fortresses built along the border with the Soviet Union, of which the Kotō fortress on the Ussuri River was the strongest. Large-scale fortifications, similar to the Maginot Line, were guarded by the 4th Border Guard Unit. The 1400-strong crew had two batteries of field guns and howitzers, the Type 90 240 mm railway gun, and the Experimental 41-cm Howitzer. When the Red Army attacked the Japanese positions around Kotō fortress in Operation August Storm in August 1945, the crew was annihilated.