 From 1933-1934, he became an instructor at the Cavalry School, and was subsequently appointed commander of the Imperial Guards Cavalry Regiment from 1934-1936.Kasahara returned to the 2nd Bureau of the General Staff in 1936 as Chief of the 4th Section, 5th Section and 6th Section, covering all of the European, American and Russian Intelligence.He was a major proponent of the Strike North Group ("hokushin-ron") philosophy, feeling strongly that the Soviet Union posed a major threat and a major opportunity for Japan.