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BATTLE // October 19, 1945

Battle of Semarang

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Overview

The Battle of Semarang, in Indonesia also known as Pertempuran Lima Hari was a clash between Japanese forces of the Sixteenth Army and Indonesian forces consisting of People's Security Agency personnel and pemuda in October 1945 at the city of Semarang, Central Java. The battle is considered as the first major clash involving the Indonesian military.

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

Significance

The Battle of Semarang, known in Indonesia as Pertempuran Lima Hari, stands as the first major clash involving the Indonesian military during the Indonesian National Revolution. Fought between Japanese forces of the Sixteenth Army and Indonesian forces comprising People's Security Agency personnel and pemuda, the engagement at Semarang in Central Java marked a formative moment in the nascent revolutionary struggle. With approximately 7,000 Indonesian fighters committed to the battle and 2,000 casualties sustained, the scale of losses underscored the severity of the confrontation and the costs of organized armed resistance in the early weeks following the declaration of independence.

Forces & casualties

Troop strength

  • Indonesia7,000
    medium

Casualties

  • Indonesia2,000
    medium29% loss rate

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4 sibling battles · 2 factions

Last verified June 2026
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