Ishiwara was assigned to the Army Staff College as an instructor, followed by a staff position within the Kwantung Army in Manchuria. He arrived there at the end of 1928, some months after the assassination of Zhang Zuolin. Ishiwara quickly realized that the confused political situation in northern China, along with Japan's already significant economic investments in the area, provided the Kwantung Army with a unique opportunity. He and Colonel Seishiro Itagaki began formulating a plan to take advantage of the situation.