Battle between Indonesian and Allied forces during the Indonesian National Revolution
One of the most successful Indonesian offensives of the National Revolution, it confined British and Dutch forces to Semarang city and established the date of Indonesian National Infantry Day.
Key Facts
- Overall duration
- 20 Oct 1945 – 2 Mar 1946
- Battle of Ambarawa duration
- 55 days days
- Magelang offensive duration
- 49 days days
- Region contested
- Semarang, Semarang Regency, Magelang Regency
- Indonesian National Infantry Day
- 15 December (commemorates this battle)
By the Numbers
Location
Cause → Event → Consequence
Following Indonesia's declaration of independence in August 1945, the newly formed Indonesian Army sought to resist reimposition of colonial control by British forces accompanied by Dutch troops in Central Java. Tensions escalated as Allied forces moved into the Semarang and Magelang areas, prompting Indonesian commanders to mount coordinated offensives.
Between 20 October 1945 and 2 March 1946, Indonesian forces conducted a composite offensive comprising the Battle of Ambarawa, the Magelang offensive, the Battle of Ungaran, and the Semarang offensive proper. Fighting took place across Semarang city, Semarang Regency, and Magelang Regency in Central Java, pitting the fledgling Indonesian Army against British and Dutch forces.
The offensive succeeded in driving British and Dutch forces out of the Magelang and broader Semarang metropolitan regions, confining their control to Semarang city alone. It became regarded as perhaps the most successful Indonesian offensive of the entire National Revolution, and 15 December was subsequently commemorated as Indonesian National Infantry Day.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
2 belligerents