The Siamese War Part II : War
The reasons for this war were unclear, but the main reasons Japanese leaders kept putting forth were that Siam was a growing threat to the peaceful Japanese nation, and that that they were building up their military and were even building chemical and biological weapons. The sources for these claims have never been verified and were most likely made up by the Japanese entirely. It was later found that these claims were false. However, the western nations went along with this excuse, knowing they were to weak to stop Japan militarily, at the moment.
The Invasion Begins
On August 1st, 1940 at 3:00 AM the Empire of Japan declared war on the sovereign nation of Siam.
Japanese troops poured over the Thai border, and there was fighting in every sector.
Battle of Singora August 1st - 3rd 1940
Especially important was the battle of Singora, where the Japanese marines were first put to the test. They were under heavier fire than expected, and so were overwhelmed in the beginning stages, but later regrouped and stormed the Thai soldiers positions. The beach and the surrounding areas were secured by August 3rd. By August 9th the marines had secured Kra and were advancing on Thom Buri. Bangkok was fiercely contested in countless battles, with the city declared secure on August 16th.
Battles of the Bight of Bangkok
With the Japanese Army advancing in the Jungles of Siam, the Imperial Navy was assigned the job of engaging and destroying the Thai fleet. Reconnaisance reported that the fleet was at anchor in Thom Buri. With the Japanese army close to capturing the port there the Royal Siamese Navy attempted to abandon the port in search of safer waters. On August 7th at 12:00 PM the Japanese scout plane piloted by Lt. Jinzo Yukata spotted the Siamese fleet steaming south. He alerted 10. Kaigun, under the command of Admiral Takasu, to the enemy's location. The Japanese fleet engaged the ships, sinking two destroyers and damaging two light cruisers and 2 destroyers, to minimal losses. By 4:00 PM the Siamese ships were done. The Siamese fleet returned to port to heal and regroup. Not satisfied with the results of this engagement, Takasu ordered the fleet to continue to scout the area.
On August 13th at 2:00 AM the Siamese Fleet, realising that Siam was near defeat, was now attempting an escape mission to reach the British colony of Malaya, and possibly dock at Singapore. However 10. Kaigun, alerted to this attempted breakout, was ordered to steam towards the remnant fleet and destroy it for good. Admiral Takasu commanded the battle directly from the bridge of his flagship
Hiei.
Battleship Hiei
Battle of the Bight of Bangkok
At 2:40 the Japanese fleet arrived at the Siamese Navy's coordinates. The first ships encountered were the remaining destroyers of the Phra Ruang Flotille. In ten minutes one destroyer was sunk and one heavily damaged. At 3:00 AM the light cruisers
Isuzu and
Yubari engaged the light cruiser
RTNS Sri Ayuthia already damaged from the August 7th conflict. By 4:00 AM the Phra Ruang Flotille was no more, and the
Sri Ayuthia and
RTNS Dhonburi were near death. The Thai cruisers continued to hold on due to a well trained crew, but organization and morale was slipping fast. By 5:00 AM the whole of 10. Kaigun was firing on the two heavily battered ships. At 5:42 AM the
Ayuthia was downed and by 5:55 the
Dhonburi was sunk. In the light of dawn the full carnage was visible. The Siamese fleet was decimated. 2 light cruisers, 2 destroyers, and 1,000+ Thai crew members were dead. The losses on the Japanese side were 2 scout planes, 67 dead and 140 wounded. It was a crushing victory for the Japanese side, and proved that Japanese training was superior, even with obsolete ships.
The Fall of Siam
With Bangkok secure the only important location to capture left was Thom Buri. Long a center of resistance, by August 29th the final battle was fought there, and by September 15th it was secure. At 5:00 on September 15th, 1940, the country of Siam was officially annexed into the Japanese Empire.
It was a relatively easy campaign, with the main obstacle being the terrain. When the Thai soldiers did stand and fight, they generally fought well, with the main resistance coming from the north and Thom Buri. The Japanese leaders were once again happy, as were the Japanese people. But like most people who have just gotten something, they now wanted something else. That something else would have have to wait until the military buildup was complete, and that time was not far off.
P.S. Sorry for the late post, but my computer was acting up and I had to fix it, and then I left for Lake Shasta for the week. I'll have faster updates now.