The British-Siamese War was a war over Kedah fought by Britain and Siam in 1874. It ended in the the victory of the Royal Siamese Army and the annexation of modern day Malaya. Siam (Thailand) declared war on Britain when British forces raided a village. Britain, which was on the peak of its imperialism, attempted to force Siamese authorities to withdraw through the "Siamese Gunboat Incident", but failed to. After this failure, Thai forces under Prince Dawongrose launched an offensive into Kedah and defeated British forces during the battle of Kuah. British forces further retreated down into modern day Malaya, but was forced out after another decisive defeat Kuala Kedah.