Japanese invasion of Lamon Bay

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Japanese invasion of Lamon Bay
Part of the Philippines campaign (1941–1942), Pacific Theater
Invasion of the Philippines, 1941.jpg
A map of Luzon Island showing Japanese landings and advances from 8 December 1941 to 8 January 1942.
Date21–23 December 1941
Location
Result Japanese victory
Belligerents
Merchant flag of Japan (1870).svg  Japan

Flag of the United States (1912-1959).svg  United States

The Japanese Invasion of Lamon Bay (Filipino: Paglusob ng mga Hapones sa Look ng Lamon) was a secondary mission in the Japanese invasion of Lingayen Gulf during the 1941-1942 Japanese conquest of the Philippines. Securing the coast southeast of Manila would complete the Japanese encirclement of the capital and would act as a diversionary attack from the Japanese main invasion force from the north. [1]

Contents

Disposition of forces

Lamon Bay is a large bay on the eastern shore of Luzon, south of Manila. However, in December prevailing winds made it a poor landing site and it was isolated from Manila by the Tayabas Isthmus.

The Lamon Bay invasion force was led by Lt General Susumu Morioka, and consisted of 7000 men of the IJA 16th Division. Morioka called for a three-prong landing at Mauban, Atimonan, and Siain, with his forces to advance immediately upon landing along Route 1 towards Laguna de Bay without waiting to secure the narrow landing site. [2]

The invasion force departed Amami Ōshima on 17 December in 24 transports only six hours after the Lingayen Bay invasion force sailed from Taiwan. The Lamon Bay force was escorted by only four destroyers and four minesweepers, but en route they were joined by Rear Admiral Kyuji Kubo with one light cruiser, two destroyers, two minesweepers and one minelayer from the Legaspi operation. On 23 December, the convoy was sighted by USS Sculpin (SS-191), but the American submarine was unable to cause any damage. On the morning of 24 December the convoy reached Lamon Bay.

American opposition to these landings was highly disorganized. The area was nominally under the control of Major General George M. Parker and the South Luzon Force with the Philippine Commonwealth Army's 41st Division and part of the 51st Division. Much of the remainder of the 51st Division had been moved south to counter the Japanese invasion of Legaspi. Other troops were still in the process of moving into position when the Japanese landed, and suffered from lack of artillery. What little artillery the South Luzon Force possessed was all based on the west coast and MacArthur refused Parker’s request for additional guns several times. [1]

The Lamon Bay invasion force consisted of the following ships: [3]

The landing

Lamon Bay landings on December 24, 1941 Lamon Bay Landings Dec 1941.jpg
Lamon Bay landings on December 24, 1941

The first Japanese detachment to land was the 2nd Battalion of the 20th Infantry Regiment under Lt Col Nariyoshi Tsunehiro at Mauban. Coming ashore at dawn on 24 December under cover by aircraft provided by the seaplane carrier Mizuho, the Japanese immediately came under attack by the Philippine 1st Infantry, which was dug in on the beach. American aircraft also attacked the transport convoy. However, by 0800 the Philippine Army had been pushed off the beach and by 0830 the town of Mauban was secured. The Philippine Army fell back five miles to the west, halting the Japanese advance towards Lucban and the south shore of Laguna de Bay at 1430. [1]

The second detachment, with the 1st Battalion of the 20th infantry regiment landed without opposition at Sianin to cover the left flank of the main invasion force, and to act as a reserve. One company was sent along the Manila Railroad to Tayabas Bay and the main force moved southeast to join with the Kimura Detachment, which was moving northwest from Legaspi. The columns joined on 27 December, cut off their escape route of the survivors of the Philippine 51st Division who were still retreating from Legaspi. [1]

Morioka’s main force came ashore two miles south of Atimonan. This included the bulk of the 20th Infantry, 16th Reconnaissance Regiment, and 22nd Field Artillery. The 20th Infantry occupied Atimonan by 1100 despite stubborn resistance by the Philippine Army, while the 16th Reconnaissance bypassed the town and pushed across the mountains to Malicbuy where the 2nd Battalion of the Philippine 52nd Infantry was still in the process of setting up defenses. With assistance of bombers from the IJAAF 8th Air Regiment, the 16th Reconnaissance quickly overwhelmed the defenders. [1]

The next American defensive line was set up at a river near Binahaan, about four miles to the west of Malicbuy. However, by late afternoon, Morioka’s main forces had completed mopping up operations in Atimonan, and the Japanese were thus able to bring their full force against the American position at Binahaan. The Americans retreated under cover of darkness along Route 1 to Pagbilao, with the Japanese in pursuit. [1]

Consequences

By the evening of 24 December, the Japanese had successfully landed at Lamon Bay, and at the cost of only 84 killed and 184 wounded had completed its encirclement of the approaches to Manila from the south. To the north, the Lingayen Gulf invasion forces had similarly achieved its objectives in securing the northern and eastern approaches to Manila. General Masaharu Homma, who had a poor opinion of the quality of the IJA 16th Division based on its combat record in China, expressed considerable surprise at the success. [1] By evening of 24 December, General Homma transferred his staff ashore at Bauang, where he set up the IJA 14th Army HQ in preparation for the final drive on Manila.

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References

  1. 1 2 3 4 5 6 7 "The Main Landings" . Retrieved 18 March 2014.
  2. Rottman, Gordon (2005). Japanese Army in World War II : Conquest of the Pacific 1941-42 . Osprey Publishing. pp.  64–65. ISBN   1841767891.
  3. Hackett, Bob; Kingsepp, Sander (2012). "RIKUGUN YUSOSEN - Kaimei Maru: Tabular Record of Movement". combinedfleet.com. Retrieved 5 November 2019.

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