By the outbreak of the Great Patriotic War, the Far Eastern Railway had already had a well-developed infrastructure. It was put on a war footing in a very short period of time and began supplying the Eastern Front with military equipment, ammunition, and provisions. The railway management provided frontline railroads with staff, rolling stock, spare parts, and materials. Also, the Far Eastern Railway played an important role in assisting the Soviet Army in defeating the Imperial Japanese Army and seizing Southern Sakhalin and the Kuril Islands.