Key Facts
- Date of operation
- 9 March 1945
- Operation codename
- Meigō Sakusen (Operation Bright Moon)
- Puppet states created
- 3 (Empire of Vietnam, Kingdom of Kampuchea, Kingdom of Luang Prabang)
- French garrisons overrun
- All garrisons across the colony
- French survivors' refuge
- Nationalist China (harshly interned)
Strategic Narrative Overview
On 9 March 1945, Japanese forces simultaneously attacked French garrisons across Indochina. Despite French intelligence having anticipated some form of Japanese aggression, the speed and coordination of the assault caught defenders off guard. All French garrisons were overrun within hours. Surviving French troops and officials who could not be captured attempted to flee northward into Nationalist China, where they were interned under difficult conditions.
01 / The Origins
By early 1945, Japan was losing World War II and feared that French colonial forces in Indochina—nominally cooperative under the Vichy administration—would side with Allied forces in the event of an invasion. To preempt a French uprising that could destabilize their strategic position in Southeast Asia, Japanese commanders planned a swift, coordinated strike to eliminate French military and administrative power throughout the colony.
03 / The Outcome
With French authority dismantled, Japan installed three client states: the Empire of Vietnam under Emperor Bảo Đại, the Kingdom of Kampuchea, and the Kingdom of Luang Prabang. These nominally independent governments acquiesced to Japanese military presence. The coup effectively ended nearly a century of French colonial administration, creating a power vacuum that contributed directly to the postwar independence movements and subsequent conflicts in the region.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent