Thailand:
Coastal defence ship HTMS
Thonburi in Bangkok, 29 July 1938.
The Battle of Ko Chang took place on 17 January 1941 during the
Franco-Thai War.
The French squadron closed on the anchorage at 05:30 on 17 January. At 05:45, they split into the three groups as planned,
Lamotte-Picquet heading for the eastern part of the anchorage,
Dumont d'Urville and
Amiral Charner continuing to the central position, and
Tahure and
Marne heading for the western side. Conditions were ideal. The weather was fine, the seas calm and almost flat. Sunrise was at 06:30, and the scene was lit only by the first rays of light on the horizon and by the dim moonlight.
A final aerial reconnaissance of the target area had been arranged, using one of the Ream-based Loire 130s.
Lamotte-Picquet carried two such aircraft, but these could not be launched due to catapult problems. At 06:05, the Loire 130 overflew the anchorage and reported two torpedo boats. This came as a nasty surprise to the French. Previous reports led them to believe that only one was present, but during the night HTMS
Chonburi had arrived to relieve HTMS
Chantaburi, which returned to Sattahip later that day for repairs.
Once their presence had been reported to
Lamotte-Picquet, the aircraft attempted a bombing attack, but were driven off by a heavy barrage of
anti-aircraft fire. The French were now aware of what they faced, but the element of surprise had been wasted and thirty minutes remained until sunrise. Having been caught with their crews asleep, the Thai ships desperately began to raise steam and prepared to slip their anchors. However, both
torpedo boats were soon sunk by heavy gunfire from
Lamotte-Picquet. The
cruiser also destroyed a shore observation post, preventing the Thai from quickly relaying information to their air forces at Chantaboun
At 06:38, lookouts aboard
Lamotte-Picquet spotted the coastal defence ship
HTMS Thonburi heading northwest, at a range of 10,000 metres (11,000 yd). A running battle began, with the ships' shell trajectories frequently blocked by the towering islets. The fire from the Thai ship was heavy, but inaccurate. By 07:15, fires could be seen on
Thonburi, which then found herself engaging not only by the cruiser but also the sloops. At the beginning of the engagement, a lucky shot from
Lamotte-Picquet killed the captain of
Thonburi,
Commander Luang Phrom Viraphan, and disrupted her operations. Believing they had a better chance of hurting the smaller French ships, the Thais shifted their fire onto
Amiral Charner, which soon found 8-inch salvoes falling around her.
Thonburi shifted fire back to
Lamotte-Picquet after a salvo from the French cruiser put her aft turret out of action. She soon reached the safety of shallow water, which the French ships could not enter for fear of grounding, but
Thonburi was already burning fiercely and listing heavily to starboard. Her remaining turret was jammed and could not fire unless the manoeuvres of the ship put it in an appropriate position. At 07:50,
Lamotte-Picquet fired a final salvo of torpedoes at 15,000 metres (16,000 yd), but lost sight of
Thonburi behind an island from which she was not seen to emerge.
At 08:40, Bérenger ordered the squadron to head for home, but this coincided with the start of the expected Thai air attacks. Thai planes dropped several bombs close to
Lamotte-Picquet and scored one direct hit; however, the bomb failed to explode.
Lamotte-Picquet's anti-aircraft guns put up a vigorous barrage and further attacks were not pressed home. The final raid occurred at 09:40, after which the French squadron returned to Saigon.
Thonburi was heavily damaged and grounded on a
sand bar in the mouth of the
Chanthaburi river, with about 20 dead. The Thai transport HTMS
Chang arrived at Ko Chang shortly after the French departed and took
Thonburi in tow, before purposefully running her aground again in
Laem Ngop. The ship capsized in the shallow waters. The torpedo boat
Chonburi was sunk with a loss of two men, as was HTMS
Songkhla with fourteen dead. The survivors were rescued by the torpedo boat HTMS
Rayong, the minelayer HTMS
Nhong Sarhai, and the fishery protection vessel
Thiew Uthok. These three ships, which had been sheltering to the north of Ko Chang, chose not to break cover and were not spotted by the French. On the other hand, the French sailors were elated, believing they had inflicted a decisive defeat while not suffering losses of significance, with only 11 men killed.