ORDER OF BATTLE // December 15, 1945
Battle of Ambarawa
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
1 sides catalogued · combined 10,000 estimated
Indonesia
10,000
Medium-confidence figure
Battle context
The Battle of Ambarawa was a component of the broader Semarang offensive, which also encompassed the Magelang offensive, the Battle of Ungaran, and the Semarang offensive proper. Fought between the newly formed Indonesian Army and British forces alongside Dutch troops across Semarang city, Semarang Regency, and Magelang Regency in Central Java, the offensive as a whole compressed British and Dutch control from the Magelang and Semarang metropolitan areas down to Semarang city alone. It is regarded as perhaps the most successful Indonesian offensive of the Indonesian National Revolution. The Indonesian Army committed 10,000 troops and sustained 2,000 casualties in the course of the broader campaign. The date of 15 December is commemorated in modern Indonesia as National Infantry Day, marking the battle's enduring place in the country's military identity.
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