Knowing of the long struggle of the Dutch to subdue Aceh province in northern Sumatra, and the ongoing resistance of the Acehnese period against Dutch rule, Fujiwara was ordered to make contact with the Aceh independence movements preparatory to the Japanese invasion of the Netherlands Indies. One of his first contacts was Sahid Abu Bakar, a religious teacher who lived in Kedah, who assisted him in recruiting a small organization to gather military intelligence, secure supplies, spread pro-Japanese propaganda, and to hinder Dutch efforts to sabotage local infrastructure. He also made contact with PUSA, the Islamic nationalist organization in Aceh, to start an armed rebellion. On the night of 11 March 1942, F-Kikan operatives and PUSA irregulars captured the Aceh capital of Banda Aceh. Thus, when the Japanese Imperial Guard Division landed the following morning, the city was already in Japanese hands.[1]
Fujiwara subsequently served as Intelligence Officer on the staff of Fifteenth Army in Burma. He reconnoitered much of the northern part of the country in preparation for Operation U-Go, the offensive into British India. Following the failure of this offensive, almost all the staff of Fifteenth Army were transferred, although Fujiwara was the last to be reassigned, in December 1944.[2]
After his recall to Japan, Fujiwara taught at the Army Staff College for a year, and was then transferred back to the field as Chief of Staff of the IJA 2nd Army in April 1945 and IJA 57th Army in June 1945. He was based in Singapore at the end of the war.
Fujiwara was one of the few officers of the Imperial Japanese Army to make the transition to the postwar Japan Ground Self-Defense Force, commanding the Home Defense Force in 1955, and the 1st District Corps -Tokyo (predecessor of 1st Division) in 1956, before his retirement as lieutenant general in 1964.[1]
Later in life, Fujiwara authored the book F. Kikan: Japanese Army Intelligence Operations in Southeast Asia during World War II, in which he described himself as the “Lawrence of Arabia of Southeast Asia”.
Lebra, Joyce C. (1977). Japanese trained Armies in South-East Asia. New York: Columbia University Press. ISBN0-231-03995-6.
Fay, Peter W. (1993). The Forgotten Army: India's Armed Struggle for Independence, 1942-1945. Ann Arbor: University of Michigan Press. ISBN0-472-08342-2.
Fujiwara, Iwaichi (1983). F. Kikan: Japanese Army Intelligence Operations in Southeast Asia During World War II. Heinemann. ISBN962-225-072-6.
(Book Review) F. Kikan: Japanese Intelligence Operations in Southeast Asia during World War II. Review author: Edward J. Drea. in Military Affairs, Vol. 49, No. 4. (Oct., 1985), p. 220.