Battle of Ko Chang

Battle of Ko Chang
	Part of the Franco-Thai War, French Indochina in World War II, the South-East Asian theatre of World War II and the Pacific Theater of World War II
	; A map of the Battle of Ko Chang
Date	17 January 1941
Location	Gulf of Thailand
Result	French victory Japanese diplomatic intervention resulting in ceasefire;
Belligerents
Vichy France French Indochina;	Thailand
Commanders and leaders
Régis Bérenger	Luang P. Viraphan †
Strength
1 light cruiser; 4 avisos; 9 aircraft; 950 men	3 coastal defence ships; 2 avisos
Casualties and losses
11 killed	36 killed (Thai figures); ~300 killed (French estimates); 3 torpedo boats sunk; 1 coastal defence ship grounded; limited damage to shore facilities

The Battle of Ko Chang took place on 17 January 1941 during the Franco-Thai War. A flotilla of French warships attacked a smaller force of Thai vessels, including a coastal defence ship. The battle resulted in a tactical victory by the French Navy over the Royal Thai Navy, although the strategic result is dubious. Two Thai ships were sunk and one was heavily damaged, with no French losses. The battle prompted Japan to intervene diplomatically and mediate a ceasefire which left Thailand in control of the contested areas of French Indochina. Within a month of the engagement, Vichy France and Thailand negotiated a peace which ended the war. ^: 22^: 78