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The Royal Siamese Armed Forces (Thai: กองทัพหลวง) were the armed forces of the Thai monarchy from the 12th to 19th centuries. The term refers to the military forces of the 
Sukhothai Kingdom
The Sukhothai Kingdom ( th, สุโขทัย, , IAST: , ) was a post-classical Thai kingdom ( mandala) in Mainland Southeast Asia surrounding the ancient capital city of Sukhothai in present-day north-central Thailand. The kingdom was ...
, the Ayutthaya Kingdom
The Ayutthaya Kingdom (; th, อยุธยา, , IAST: or , ) was a Siamese kingdom that existed in Southeast Asia from 1351 to 1767, centered around the city of Ayutthaya, in Siam, or present-day Thailand. The Ayutthaya Kingdom is consi ...
, the Thonburi Kingdom
The Thonburi Kingdom ( th, ธนบุรี) was a major Siamese kingdom which existed in Southeast Asia from 1767 to 1782, centered around the city of Thonburi, in Siam or present-day Thailand. The kingdom was founded by Taksin the Gre ...
and the Early Rattanakosin Kingdom in chronological order. The army was one of the major military forces of Southeast Asia
Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical United Nations geoscheme for Asia#South-eastern Asia, south-eastern region of Asia, consistin ...
. With a reform into a new Western-style army in 1852, the Royal Siamese Army became a new European-trained military force.
The Royal Thai Armed Forces
The Royal Thai Armed Forces (RTARF) ( th, กองทัพไทย; ) are the armed forces of the Kingdom of Thailand.
The nominal head of the Thai Armed Forces (จอมทัพไทย; ) is the King of Thailand. The armed forces are ...
are the contemporary military of Thailand.
Organization
The Royal Siamese Army was organized into three general tiers: the Palace Guards, the Capital Defense Corps, and the field levies. Only the first two were the standing military. They protected the sovereign and the capital region, and formed the nucleus of the armed forces in wartime. The third, the field levies or conscripts, were usually raised just prior to or during wartime, and provided manpower to resist attacks and project power beyond the boundaries of the empire. Most of the field levy served in the