Japanese paratroopers of the 2nd Yokosuka Naval Landing Force under the command of Lieutenant Colonel Genzo Watanabe (standing on top in the left) inside a transport ship heading to Borneo prior to their invasion in December 1941.
The invasion of Borneo was part of a large Japanese invasion in the Pacific, which starting on December 7, 1941 attacked or invaded the United States, Great Britain, and Thailand, including territories in Burma, Malaya, and the Pacific. Previously, they had only been at war with China, even though they had signed the tripartite act with Nazi Germany and the Soviet Union.
The so-called "White Rajahs", the Brooke family, had ruled Sarawak, on the northwest of Borneo, for almost a century, first as Rajahs under the Sultanate of Brunei (a by then tiny but once powerful state entirely enclosed within the borders of Sarawak), and from 1888 as a protectorate of the British Empire. The northeast of the island comprised North Borneo, since 1882 another British protectorate under the British North Borneo Company. Offshore lay the small British crown colony of Labuan.
The rest of the island—collectively known as Kalimantan—was under Dutch control. The Netherlands were invaded by Nazi Germany in 1940. However, Free Dutch forces—mainly the Royal Netherlands Navy and the 85,000-strong Royal Netherlands East Indies Army (KNIL, including a small air service)—fought on, spread throughout the Dutch East Indies, and by December 1941 under an embryonic and somewhat chaotic joint Allied command which became the short-lived American-British-Dutch-Australian Command (ABDACOM).
The Tripartite Pact—between the three Axis powers of Germany, Japan and Italy—guaranteed mutual support, and this paid off for Japan in July 1941 when French weakness in the wake of the fall of France to Germany allowed Japan to occupyFrench Indo-China (now modern Vietnam, Laos and Cambodia). This blocked a supply route for the Kuomintang, against whom Japan had been fighting since 1937, the Second Sino-Japanese War. It also gave Imperial Japan a seaboard facing Sarawak and North Borneo across the China Sea. In December 1941, Japan attacked US possessions in Hawaii and the Philippines, declaring war on the US and finally precipitating Germany's official declaration of war on America, according to the Pact.
With its rich petroleum exploitation capacity, for instance at Tarakan, Balikpapan and Banjarmasin, Borneo was a prime target for Japan, and a very poorly guarded one. Chronically short of natural resources, Japan needed an assured supply of fuel to achieve its long-term goal of becoming the major power in the Pacific. Borneo also stood on the main sea routes between Java, Sumatra, Malaya and Celebes. Control of these routes were vital to securing the territory.
The main objectives were the oilfields at Miri in Sarawak region and Seria in Brunei. The oil was refined at Lutong near Miri. Despite rich oil supplies, the Sarawak region had no air or sea forces to defend it. Only in late 1940 did Air Chief Marshal Sir Robert Brooke-Popham order the 2nd Battalion, 15th Punjab Regiment, a heavy 152 mm (6 in) gun battery from the Hong Kong-Singapore Royal Artillery, and a detachment of the 35th Fortress Company (Royal Engineers) to be positioned at Kuching. They numbered about 1,050 men. In addition, the Brooke White Rajah government also organised the Sarawak Rangers. This force consisted of 1,515 men who were primarily Iban and Dayak tribesmen. Altogether these forces were commanded by British Lieutenant Colonel C.M. Lane and was known as "SARFOR" (Sarawak Force).
After having heard of the attack on Pearl Harbor, on 8 December 1941, the Brooke government ordered that the oilfields at Miri and Seria and refinery at Lutong be quickly demolished.
Defence in Singkawang and Pontianak (Dutch East Indies)
The Dutch forces had an important airfield near the border of British Malaysia (Sarawak) called "Singkawang II", which was defended by about 750 Dutch troops. On 25 November, five Brewster 339 Buffalo fighter planes arrived for local defence, followed in the beginning of December by Martin B-10 bombers.
Part of the Japanese force was allocated to capture Miri and Seria, while the rest would capture Kuching and nearby airfields. The convoy escaped detection and, at dawn on 16 December 1941, two landing units secured Miri and Seria, encountering very little resistance from British forces. A few hours later, Lutong was captured as well.
Soon after the news of Japanese attack on Pearl Harbor, Japanese planes were seen making reconnaissance flights over Miri.[6] The Brooke government decided on a complete destruction of oilfields and airfields in Miri. Shell company officials received orders to carry out the Denial Scheme on 8 December 1941. In the evening on the same day, the task was completed.[7] All producing oil wells were sealed up with vital equipment and machinery dismantled and shipped off to Singapore. Skilled workers and important company papers also went along with the equipment and sent to Singapore.[6] The Punjab Regiment and several officials were sent to guard Kuching.[7] On 16 December 1941, 9 days after the Pearl Harbor bombing, Japanese troops consisting of 10,000 men landed on Tanjung Lobang Beach, Miri without much resistance.[7] However, on 17 December 1941, a Dutch flying boat from Tarakan Island attacked the Japanese destroyer Shinonome (under the command of Hiroshi Sasagawa) off Miri. The ship was sunk along with the entire crew of 228.[8] Another flying boat X-33 also damaged a Japanese transport ship.[7]
Dutch air raid and naval actions
Dutch Martin B-10 bombers attacked Japanese shipping from their base, 'Singkawang II' at Miri, on 17 December, but their attempt failed. The three Dornier Do 24Ks followed up with their own attack, but one was shot down, possibly by a floatplane from Kamikawa Maru.[9] The remaining two, benefiting from cloud cover, were never seen by the Japanese. One flying boat scored two 200kg bomb hits on Shinonome, causing a massive explosion, while a near miss ruptured its hull plating. The destroyer's stern broke off and the ship sank within minutes.[9] The last flying boat dropped its bombs on a freighter, but missed. The B-10 bombers made attacks at Miri 18 and 19 December, but retired to Sumatra on 23 December since Singkawang II airfield was discovered by the Japanese, who began attacking it the same day.
On 22 December, a Japanese convoy left Miri for Kuching, but was spotted by the Dutch flying boat X-35, which radioed a warning to the Dutch submarine HNLMSK XIV, under the command of Lieutenant Commander Carel A. J. van Groeneveld. At 20:40 on 23 December, K XIV infiltrated the convoy and began its attack. The army transports Hiyoshi Maru and Katori Maru were sunk with the loss of hundreds of troops. Hokkai Maru was beached to prevent her from sinking, and another transport was less seriously damaged.[9] The rest of the troops were able to land. Although 2nd Battalion, 15th Punjab Regiment, resisted the attack, they were soon outnumbered and retreated up the river. By the afternoon, Kuching was in Japanese hands.
On the night of 23–24 December, HNLMS K XVI torpedoed the Japanese destroyer Sagiri30 miles (48km) north of Kuching, becoming the first Allied submarine in the Pacific to sink a warship. K XVI was lost with all hands during the day by a torpedo from Japanese submarine I66.[9]
On 24 and 28 December, B-10 bombers from a different unit flew missions against Kuching from Singapore, Sembawang. On 26 December, B-10s operating out of Samarinda sank a Japanese minesweeper and a collier.[9]
Brunei
Meanwhile, on 31 December 1941, the force under Lieutenant Colonel Watanabe moved northward to occupy Brunei, Labuan Island, and Jesselton (now called Kota Kinabalu). On 18 January 1942, using small fishing boats, the Japanese landed at Sandakan, the seat of government of British North Borneo. The North Borneo Armed Constabulary, with only 650 men, hardly provided any resistance to slow down the Japanese invasion. On the morning of 19 January, Governor Charles Robert Smith surrendered British North Borneo and was interned with other staff.[citation needed]
Kuching Airfield and retreat
At about 16:40 on 25 December, Japanese troops successfully captured Kuching airfield. The Punjab regiment retreated through the jungle to the Singkawang area. After Singkawang was secured as well on 29 December, the rest of the British and Dutch troops retreated southward further into the jungle, trying to reach Sampit and Pangkalanbun, where a Dutch airfield at Kotawaringin was located. South and central Kalimantan were taken by the Japanese Navy following attacks from east and west. The town of Pontianak was finally occupied by the Imperial Japanese forces on 29 January 1942. After ten weeks in the jungle-covered mountains, Allied troops surrendered on 1 April 1942.[citation needed]
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