sentences:  When the Imperial Japanese Army invaded Manchuria in 1931, they were accompanied by a detachment from the Imperial Japanese Navy (IJN), which provided for coastal defense.However, the main naval requirement for Manchuria was the defense of its extensive border river system with the Soviet Union.Immediately after the Manchurian Incident of 1931, Kuomintang Northeastern Navy Vice-Minister Shen Hung-lieh and Fleet Commander Hsien Kung-che deserted their posts.