Ancient military forces ( Christian era 1238-1852 )
The Royal Siamese Armed Forces was the military arm of the Siamese monarchy from the 12th to the 19th centuries. It refers to the military forces of the Sukhothai Kingdom, the Ayutthaya Kingdom, the Thonburi Kingdom and the early Rattanakosin Kingdom in chronological order. The army was one of the major armed forces of Southeast Asia. The wartime army also consisted of elephantry, cavalry, artillery, and naval units.