This is a monument to the Thai expeditionary force that fought in European battlefields during World War I. After war broke out in 1914, Thailand had remained neutral for about three years. When the United States declared war on Germany in April 1917, King Rama VI still waited on the sidelines. Thailand had good relations with Germany, although eventually King Rama VI joined the Allies by declaring war on Germany and sent a militia of 1,284 volunteers to Europe on 20 June 1918. King Rama IV said that joining the Allies would be an excellent opportunity for us to gain equality with other nations. Thailand had lost land to France and the United Kingdom and had to accept the imposition of extraterritorial rights for the citizens of these nations. By joining the war with the Allies, he hoped that they would be more flexible in amending those treaties in future. The expeditionary force returned to Thailand on 21 September 1919 and the ashes of the dead veterans were taken to be enshrined here three days later. The names of 19 soldiers killed in the Western Front have been inscribed.