I hope someone can settle this query. A friend here says July 22 1918 was the date Thailand declared war on the Germans, whilst his friend says it's the date Thai troops sailed for the war in Europe.

Can anyone clarify this?

Thank you.

I think someone is a year out, this page http://www.firstworldwar.com/features/thailand.htm says:-

Therefore, on 22 July 1917, despite the misgivings of some members of the Royal government, King Vajiravudh (Rama VI) declared war on Germany and Austria-Hungary. The Thais immediately interned and later seized as war reparations no less than 12 ocean-going ships of the North German Line (NGL).