1.Admiral Sangworn Suwannacheep's Memoir, printed in his funeral, an officer experted in gunnery, he was a former HTMS Sri Ayudhya's commanding officer and a naval 1st flotilla commander during the 1940-1941 war and was on board HTMS Sri Ayudhya during battle of Koh Chang. So, this could be the solid proof that whether HTMS Sri Ayudhya was present at the battle of Koh Chang or not.
Another interesting topic is that he went to Japan before the war to study Japanese, bring our new gunboat (HTMS Sri Ayudhya) back and visit Imperial Japanese Navy's technology and training. He was invited to stay on board IJN Heavy Cruiser Takao during IJN combined fleet naval exercises in 1934 before the war started. So he was a few RTN officers to directly experience IJN naval capability before he brought HTMS Sri Ayudhya back home.
He also honestly criticized our poor naval capability compared to IJN, that may be because this is his personal memoir intended to keep it privately and was published by his sons after he passed away.
2.General Mangorn Phromyodhi's funeral book, he was commander in chief of Burapha(Eastern) Army that attacked combodia front during 1940-1941. The book includes official record of his army.
I will translate and put them on as soon as possible.
Other source for this blog
3."Indochina War" by Charlie Iamkrasindh
4."When Thonburi fights" by Lieutenant Junior Grade Jongjitt Sanghadul, HTMS Thonburi's aft turret gunnery officer.
