Thailand. ( French Aviation Detachment in Siam ). 1947. Stamp-less military mail envelope addressed to the 'General Commandant Superior of the Army's S.P. 50630, Saigon' cancelled by 'Escale / Francaise / Bangkok' with 'Croix de Lorraine' and arrival 'Poste Aux Armees / 405' date stamp on reverse. Unique item from the French / International excursion in Siam January 1947.
As the result of the French - Siamese War 23/Nov/1940 until 22/Jan/1941 France succeeded territories in North-West Cambodia and West of the Mekong in Laos to Siam.
After the liberation of French Indo-China by French and Indo-Chinese Troops and with international pressure Siam voluntarily relinquished the territories annexed to them in 1941.
The region around Bassac ( Laos ) was returned on 15/4/1946.
As a result of the unrest in the region an alliance between Ho-Chi-Minh (Communist China) and the King of Laos to reclaim lands in Northern Laos led to strong tension in Siam. A coalition of Japanese Troops plus Viet-Minh army re-in forces with Siamese Troops led to a French Detachment been sent to Bangkok in January 1947.
On the 27/Nov/ 1947 all territories annexed in 1941 had been returned to France.