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BATTLE // October 27, 1945

Battle of Surabaya

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Overview

The Battle of Surabaya was a major battle in the Indonesian National Revolution fought between regular infantry and militia of the Indonesian nationalist movement and British and British Indian troops against the re-imposition of Dutch colonial rule. The peak of the battle was in November 1945, and was the largest single battle of the revolution and became a national symbol of Indonesian resistance. Considered a heroic effort by Indonesians, the battle helped galvanise Indonesian and international support for Indonesian independence. 10 November is celebrated annually as Heroes' Day.

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

Significance

The Battle of Surabaya was the largest single battle of the Indonesian National Revolution, pitting Indonesian regular infantry and militia against British and British Indian troops deployed in connection with the re-imposition of Dutch colonial rule. Though the British force of roughly 30,000 outnumbered the Indonesian side, Indonesian casualties ranging from 6,300 to 16,000 reflected the intensity of resistance mounted by nationalist fighters. The battle galvanized both domestic and international support for Indonesian independence, elevating the conflict from a local confrontation into a cause with wider political resonance. It became a foundational symbol of the revolution, and 10 November is commemorated annually in Indonesia as Heroes' Day, marking the battle's enduring place in national memory.

Forces & casualties

Troop strength

  • Indonesia20,000
    medium
  • United Kingdom30,000
    medium

United Kingdom fielded a 1.5 : 1 numerical advantage

Casualties

  • Indonesia6,300–16,000
    medium56% loss rate
  • United Kingdom2,000
    medium7% loss rate

Commanders (10)

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Related

4 sibling battles · 2 factions

Last verified June 2026
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