A royal proclamation of the king of Thailand declaring war on Great Britain &amp; the United Stares, dated 25 January 1942.
Government of Thailand
1942-01-25
<a rel="nofollow" class="external text" href="http://www.ratchakitcha.soc.go.th/DATA/PDF/2485/A/005/244.PDF">Royal Thai Government Gazette, volume 59, issue 5, dated 25 January 1942, page 244</a>