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BATTLE // December 15, 1945

Battle of Ambarawa

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Overview

The Semarang offensive is composite of the Battle of Ambarawa, Magelang offensive, Battle of Ungaran or Ungaran offensive, and Semarang offensive proper. This major battle took place between the recently created Indonesian Army and the British Army with the Dutch forces that occurred between 20 October 1945 and 2 March 1946 in Semarang city, Semarang Regency, and Magelang Regency in Central Java, Indonesia. Perhaps the most successful Indonesian offensive of the Indonesian Revolution, this offensive tightened British and Dutch control from the Magelang and Semarang metropolitan areas to only Semarang city. In modern times, 15 December is celebrated as the Indonesian National Infantry Day.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

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.

Forces & casualties

Troop strength

  • Indonesia10,000
    medium

Casualties

  • Indonesia2,000
    medium20% loss rate

Commanders (5)

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Related

4 sibling battles · 2 factions

Last verified June 2026
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