During the
Indonesian National Revolution, Simatupang, now a colonel, joined the
Siliwangi Division in
Central Java, and by January 1950, following the death of General
Sudirman, he was acting chief of staff of the Indonesian Armed Forces (
Angkatan Perang). Like Army Chief of Staff General
Nasution, he was an "administrator", committed to the reduction in size of the armed forces after independence had been won to bring about a professional military. He opposed efforts by a disgruntled rival, Colonel Bambang Supemo, to replace Nasution, but was himself criticized for apparent political bias after articles he wrote in 1952 were perceived as favoring the
Socialist Party of Indonesia (PSI). After the
incident on 17 October 1952, in which the army brought demonstrators and troops to the
Merdeka Palace to persuade President
Sukarno to dissolve parliament, Simatupang's days were numbered, and on 4 November 1953, his post as chief of staff was abolished, effectively dismissing him. He then took a position as an adviser to the Ministry of Defense and then became a lecturer at the Army Staff College and the Military Legal Academy before resigning from the military altogether in 1959. ==Post-military life==