|Battle of Mindanao|
|Part of World War II, Pacific theater|
LCM carries U.S. troops up the Mindanao River to Fort Pikit :625
|Commanders and leaders|
|Eighth Army||102,000 :587|
|Casualties and losses|
820 killed and 2,880 wounded on E. Mindanao :648
12,865 killed, 600 captured, 8,235 missing on E. Mindanao :647
The Battle of Mindanao (Filipino: Labanan sa Mindanao Cebuano: Gubat sa Mindanao) was fought by United States forces and allied Filipino guerrillas against the Japanese from 10 March to 15 August 1945 on the island of Mindanao in the Philippines in a series of actions officially designated as Operation VICTOR V. It was part of the campaign to liberate the Philippines during World War II. The battle was waged to complete the recapture of the southernmost portions of the archipelago.
Filipino is the national language of the Philippines. Filipino is also designated, along with English, as an official language of the country. It is a standardized variety of the Tagalog language, an Austronesian regional language that is widely spoken in the Philippines. As of 2007, Tagalog is the first language of 28 million people, or about one-third of the Philippine population, while 45 million speak Tagalog as their second language. Tagalog is among the 185 languages of the Philippines identified in the Ethnologue. Officially, Filipino is defined by the Commission on the Filipino Language as "the native dialect, spoken and written, in Metro Manila, the National Capital Region, and in other urban centers of the archipelago."
The Cebuano or Cebuan language, also often referred to informally by most of its speakers simply as Bisaya, is an Austronesian language spoken in southern Philippines, namely in Central Visayas western parts of Eastern Visayas and on majority of Mindanao. It is spoken primarily by various Visayan ethnolinguistic groups who are native to those areas, mainly the Cebuanos. While Filipino (Tagalog) has the most number of speakers of Philippine languages, Cebuano had the largest native language-speaking population in the Philippines until about the 1980s. It is by far the most widely spoken of the Visayan languages, which are in turn part of the wider Philippine languages.
The Empire of Japan was the historical nation-state and great power that existed from the Meiji Restoration in 1868 to the enactment of the 1947 constitution of modern Japan.
The campaign for Mindanao posed the greatest challenge for the liberating Allied forces, primarily for three reasons: the island's inhospitable geography; the extended Japanese defenses; and the strength and condition of the Japanese forces, which contained the significantly remaining concentration of combat troops in the Philippines.
Like most of the Philippine Islands and other similar places the U.S. Army operated elsewhere in the Pacific, the geographical conditions of Mindanao, the second largest island in the Philippines, offered very little inspiration for soldiers who would have to fight there. It boasted a long and irregular coastline, and the topography was generally characterized as rugged and mountainous. Rain forests and numerous crocodile-infested rivers covered the terrain, the rest by either lake, swamp or grassland. These grassland regions—along with dense groves of abacá trees, a source of hemp fiber—offer the worst obstacles, limiting vision and sapping the strength of soldiers.
Abacá, binomial name Musa textilis, is a species of banana native to the Philippines, grown as a commercial crop in the Philippines, Ecuador, and Costa Rica. The plant, also known as Manila hemp, has great economic importance, being harvested for its fiber, also called Manila hemp, extracted from the leaf-stems.
The few roads in Mindanao further complicated the problem of movement. The generously named Highway 1 cut across the southern portion of the island, from just south of Parang on Illana Bay in the west to Digos on the Davao Gulf in the east and then north to Davao. The other, Sayre Highway the main north-south road, started at Kabacan, midway between Illana Bay and Davao Gulf, then ran north through the mountains of Bukidnon and Macajalar Bay (off Misamis Oriental Province) on the northern coast.
Digos, officially the City of Digos,, or simply referred to as Digos City, is a 2nd class city and capital of the province of Davao del Sur, Philippines. According to the 2015 census, it has a population of 169,393 people.
Davao Gulf is a gulf situated in the southeastern portion of Mindanao in the Philippines. It has an area of 308,000 hectares. Davao Gulf cuts into the island of Mindanao from Philippine Sea. It is surrounded by all five provinces in the Davao Region. The largest island in the gulf is Samal Island. Davao City, on the gulf's west coast, is the largest and busiest port on the gulf. The Bagobo, a tribe known in Davao, are living in the Davao Gulf. With the thrust of Davao City towards Information Technology and IT-Enabled Services (ITES), Davao City and the Davao Gulf area have also earned the moniker Silicon Gulf.
Davao City, officially the City of Davao, is a 1st class highly urbanized city in the island of Mindanao, Philippines. The city has a total land area of 2,443.61 km2 (943.48 sq mi), making it the largest city in the Philippines in terms of land area. It is the third-most populous city in the Philippines after Quezon City and Manila, the most populous city in the country outside Metro Manila, and the most populous in Mindanao. As of the 2015 census, the city had a population of 1,632,991.
The strongest of the Japanese defenses were concentrated around the Davao Gulf area, which was heavily mined to counter an amphibious landing, and in Davao City, the island's largest and most important city. Artillery and anti-aircraft batteries extensively ringed the coastal shoreline defenses. Believing that the Americans would ultimately attack from Davao Gulf and also anticipating that they would be eventually driven from the city, the Japanese also prepared defensive bunkers inland behind its perimeter where they could retire and regroup, with the intention of prolonging the campaign as much as possible.
On 10 March 1945, the U.S. Eighth Army—under Lieutenant General Robert L. Eichelberger—was formally ordered by General Douglas MacArthur to clear the rest of Mindanao, with the start of Operation VICTOR V, with expectations that the campaign would take four months. Eichelberger had misgivings about the projected timetable. His Eighth Army staff came up with a more effective plan.
The Eighth United States Army (EUSA) is a U.S. field army which is the commanding formation of all United States Army forces in South Korea. It commands U.S. and South Korean units and is headquartered at the United States Army Garrison-Humphreys, in the Anjeong-ri of Pyeongtaek, South Korea.
Robert Lawrence Eichelberger was a general officer in the United States Army who commanded the Eighth United States Army in the Southwest Pacific Area during World War II.
Douglas MacArthur was an American five-star general and Field Marshal of the Philippine Army. He was Chief of Staff of the United States Army during the 1930s and played a prominent role in the Pacific theater during World War II. He received the Medal of Honor for his service in the Philippines Campaign, which made him and his father Arthur MacArthur Jr. the first father and son to be awarded the medal. He was one of only five to rise to the rank of General of the Army in the US Army, and the only one conferred the rank of field marshal in the Philippine Army.
Instead of the expected headlong frontal assault on the Japanese defenses, the plan called for securing a beachhead at Illana Bay in the undefended west, then driving eastward more than 100 miles (160 km) through jungles and mountains to strike from the rear. The objective, which called for achieving surprise and pressing forward quickly and aggressively by the invading forces, Eichelberger deemed, could unhinge the Japanese both physically and psychologically. The key to success involved the beachhead performance of the landing force and the ability of units to maintain the momentum of their attack, preempting Japanese reactions, and hopefully before the rainy season started, which would impede movement.
Ground operations were assigned to X Corps, under Major General Franklin C. Sibert, 620 with Major General Roscoe B. Woodruff's 24th Infantry Division and Major General Clarence A. Martin's 31st Infantry Division as the principal combat units. Amphibious Task Group 78.2 (TG 78.2), under Rear Admiral Albert G. Noble, was tasked to carry the 24th Division and X Corps headquarters to the assault beaches near Malabang by 17 April to secure a forward airfield. Five days later, the 31st Division was expected to be in Parang, 20 miles (32 km) south, located near Highway 1, the route to Davao. :620:
X Corps was a corps of the United States Army in World War II and the Korean War.
Franklin Cummings Sibert was a United States Army general. During World War II, Sibert was originally the commander of the 6th Infantry Division but was promoted to command the X Corps of General Walter Krueger's US Sixth Army. His corps took part in the landing operations of the Battle of Leyte in the Philippines.
Major General Roscoe Barnett Woodruff was a career United States Army officer who fought in both World War I and World War II and served for 38 years. During World War II he commanded numerous divisions and corps in Europe and the Pacific.
On the same day Eichelberger's forces were ordered to invade Mindanao, remnants of Major General Jens A. Doe's 41st Infantry Division carried out Operation VICTOR IV, the seizure of Zamboanga, the large peninsula that extended to the southwest, concurrent with the recapture of Palawan, dubbed Operation VICTOR III. A sizable force—numbering about 8,900 men of Lt. Gen. Tokichi Hojo's 54th Japanese Independent Mixed Brigade (IMB)—had established strong defensive positions around Zamboanga City at the southern tip of the peninsula. 593:
The slow construction of the airfield at Palawan posed a problem for tactical air support augmenting the Zamboanga operation. With the seizure of a makeshift airstrip at Dipolog, about 145 miles (233 km) to the northeast of Zamboanga City, the Americans rapidly exploited the opportunity, airlifting two reinforced companies from the 21st Infantry Regiment, 24th Division to ensure control of the airstrip. :591–592 Soon thereafter, Marine Aircraft Groups Zamboanga (MAGSZAM) under Col. Clayton C. Jerome was flying sorties off the airstrip to cover naval bombardment and landing preparations off Zamboanga City.
After the bombing of the landing areas by the 13th Air Force and a three-day bombardment by the U.S. Navy, the 162nd and 163rd Infantry Regiments landed 3 miles (4.8 km) west of Zamboanga City at San Mateo. :592–593 Japanese opposition to the landings were minimal, and the 41st Division troops quickly captured the city, which was decimated by the pre-invasion bombardments. :593 The next day, 11 March, the Americans encountered strong resistance when they attacked Japanese positions in the hills overlooking the coastal plain. For two weeks, American infantry—ably supported by Marine aviation and naval gunfire—fought the Japanese along a 5 miles (8.0 km) front, in terrain so rugged that tanks could not be used, and in positions heavily fortified with deep earthen emplacements, barbed wire, minefields, and booby traps. :596
On 23 March, after heavy fighting, the center of the Japanese line finally broke, and in the next three days, the 162nd Infantry continued eliminating resistance in the central sector. The 186th Infantry replaced the 163rd and continued the attack. The 54th Japanese IMB was forced to pull out a week later, harried by guerrilla units, retreating through the peninsula and into the jungle. After some time, mopping-up operations resulted in 220 Americans killed, compared to 6,400 Japanese dead. 596–597:
Alongside the Zamboanga operation, smaller units of the 41st Division invaded the Sulu Archipelago, a long stretch of islands reaching from the Zamboanga Peninsula to north Borneo. Rapidly taken in succession were Basilan, Malamaui, Tawi-Tawi, Sanga Sanga and Bangao. On 15 April, strong resistance at Jolo was encountered. Anchoring their stubborn defense around Mount Daho, some 3,750 Japanese troops held off the 163rd Infantry, supported by Filipino guerrillas. By 22 April, the Allies took the position after hard fighting and the rest of the Japanese troops fled and held out in the west for another two months. The 163rd suffered 35 dead and 125 wounded by mid-June 1945, while some 2,000 Japanese perished. 597–599:
As Rear Admiral Noble's TG 78.2 moved toward Illana Bay to prepare the landings at Parang, Colonel Wendell Fertig—commander of guerrilla forces in Mindanao—sent word that his guerrillas controlled Malabang and its airstrip. :621 Starting on 5 April, Colonel Jerome's Marine aviators from Dipolog moved to the Malabang airstrip, and with targeting information from the guerrillas, proceeded to bomb the Japanese positions. By 11 April, the remaining Japanese forces fled toward Parang, and friendly forces were in complete control of Malabang. :621 Sibert, Woodruff, and Noble realized they had the opportunity to speed up the initial penetration of central Mindanao and quickly changed their plans to take advantage of the new developments. The 24th Division would come ashore at Parang, much closer to Highway 1, thus speeding up the operation. :621
While the Parang landings proceeded on 17 April and the 24th Division quickly heading inland, the Eighth Army planners assumed correctly that the Japanese might destroy the bridges along Highway 1, and they decided to use the 533rd Engineer Boat and Shore Regiment, 3rd Engineer Special Brigade to exploit the Mindanao River. This waterway ran roughly parallel to Highway 1 and was navigable for 35 miles (56 km). A small fleet of gunboats—under the command of Lieutenant Colonel Roberto Amputs—sailed upriver and seized Kabacan and the junction of Highway 1 and Sayre Highway on 22 April. This startled the nearby Japanese garrisons, and they fled north and west. :626 The Mindanao River became the main line of supply, as troops and rations were disgorged far upriver.
On 22 April, the 31st Division waded ashore, with Marine Aircraft Group 24 arriving at Malabang to provide air support for Mindanao ground operations. With both divisions ashore and ahead of schedule, General Sibert ordered the 24th to continue its advance up Highway 1 to Digos, then seize Davao City. The 31st would follow to Kabacan and then attack north up Sayre Highway toward Macajalar Bay. 627–628:
Tactically, the Japanese blundered in allowing the Americans to seize the key road junction of Kabacan so easily; the 30th and 100th Japanese Divisions were hopelessly separated with the American advance, while allowing X Corps to build up momentum and ultimately lead to their destruction. That Japanese error was the direct result of the surprise achieved by Eichelberger's decision to land at Illana Bay.
With General Woodruff's 24th Division moving so rapidly, the Americans were almost on top of the Japanese around Davao before General Morozumi learned too late that the western landing was, in fact, not a diversion. Upon reaching Digos on 27 April, the Americans quickly overwhelmed the defending Japanese, who were prepared only to repel an assault from the sea, not from their rear. The 24th Division immediately turned north and headed toward Davao City. 628:
On 3 May 1945, the first combat elements of the 24th Division entered Davao City against less opposition than had been expected. 628 The Japanese had contented themselves with destroying the city as best they could before withdrawing inland. While it took just 15 days, despite severe heat and humidity and constant rain, with an entire division travelling 115 miles (185 km) and seizing the last major Philippine city under Japanese control, the real battle for Mindanao had begun. Up to this point, X Corps had deliberately bypassed the main Japanese defenses, which they planned to turn to eliminate them.[ clarification needed ]:
A chronicler for the 24th Division wrote:
The soldiers of the 24th Infantry, considered the post-Davao operations to be the hardest, bitterest and, most exhausting battle of the ten island campaigns. In addition to the tenacious defense put up by the Japanese, another punishing aspect of the subsequent combat was the proliferous fields of abaca. To the foot soldiers fighting in the Davao province, the word abaca was synonymous with hell...Countless acres around Davao are covered with these thick-stemmed plants, fifteen to twenty feet high; the plants grow as closely together as sugar cane, and their long, lush, green leaves are in a welter of green so dense that a strong man must fight with the whole weight of his body for each foot of progress...In the abaca fields, visibility was rarely more than ten feet. No breeze ever reached through the gloomy expanse of green, and more men - American and Japanese - fell prostrate from the overpowering heat than bullets. The common way for scouts to locate an enemy position in abaca fighting was to advance until they received machinegun fire at a range of three to five yards. For the next two months, in such an environment, the 24th Division fought the Japanese. While the infantry sought out the Japanese defenses, platoons and squads worked through the abaca and surrounding jungle to seek out enemy bunkers and spider holes.
In this way, fighting progressed slowly, but the Americans were making headway. At Libby Airdrome and the village of Mintal, some 5 miles (8.0 km) west of Davao City, the 21st Infantry Regiment was attacked on three sides by a numerically stronger enemy. :630 Individual acts of heroism often spelled the difference between victory and defeat in the desperate fighting. On 14 May, posthumous Medal of Honor awardee, Private First Class James Diamond of D Company fell mortally wounded as he was leading a patrol to evacuate more casualties when came under heavy attack. He drew enemy fire while sprinting to an abandoned machinegun and was caught in a hail of bullets, but his sacrifice enabled his patrol to reach safety.
By 17 May, exhausted and bloodied, the 24th Division renewed its offensive, and this time, the 19th Infantry Regiment, 633–635 supported by Fertig's guerrillas, blew open the Japanese eastern flanks before capturing the villages of Tacunan, Ula, Matina Biao, Magtuod and Mandug on 29 May. The Japanese 100th Division collapsed and retreated. But soon fighting erupted into pursuit and mopping-up operations against bypassed Japanese pockets, which later claimed the life of the 19th Infantry's commander, Colonel Thomas "Jock" Clifford Jr.:
The fighting around the fringes of Davao City cost the 24th Infantry Division some 350 dead and 1,615 wounded, while the Japanese 100th Division suffered about 4,500 casualties. 635:
Meanwhile, the 31st Division had forged ahead to the town of Kibawe on Highway 1, some 40 miles (64 km) away, since 27 April, with the 124th Infantry Regiment of Colonel Edward M.Cullen at point, where the first monsoon rains started creating havoc on the advance. Running into a Japanese battalion hurrying south, Lieutenant Colonel Robert M. Fowler's 2nd Battalion, with Battery B, 149th Field Artillery attached, engaged the Japanese with much needed artillery fire, killing at least 50 and sending the rest fleeing. :638
On 3 May, the 31st Division reached Kibawe, 638 against stiffening Japanese resistance. The town led to a supposed Japanese supply trail that twisted and turned south, until it reached the ocean shore village of Talomo in Davao City. The treacherous terrain proved equally dangerous to both sides as they struggled in the ensuing battle for the Talomo trail on 11 May. About 1,000 Japanese held the trail, but jungle rain forests, torrential rains and abysmal trail conditions were the real factors. Airdropped supplies to the isolated infantrymen were common as the trail was impassable to motor vehicles. By 30 June, the 167th Infantry managed to move only 5 miles (8.0 km) beyond the Pulangi river, even with the assistance of Filipino guerrillas. It lost 80 men and 180 wounded to the Japanese, who themselves suffered about 400 dead.:
On 6 May, the 124th Infantry Regiment continued to move up Sayre Highway without the Talomo trail reconnaissance operation in full swing, and in doing so, it moved into its toughest fight of the Mindanao campaign. A Japanese battalion, ordered by Morozumi to delay the 124th at Maramag some 30 miles (48 km) south to enable the regrouping of his 30th Division, did so with such ferocity, that it took six days for the 124th to reach Maramag. :641 The battle area from Talomo to Maramag was later renamed Colgan Woods by the troops in remembrance of Captain Thomas A. Colgan, an Army chaplain who was killed during one of his repeated efforts to aid wounded soldiers in the line of fire. The battle was one of the many brutal struggles in the Pacific theater that never made any headlines.
Firing from dugout positions, camouflaged spider holes with connecting tunnels, and virtually invisible pillboxes, the defending Japanese chose to die in place rather than retreat. Banzai charges struck the 124th, fighting without supporting artillery, first on 7 May and then on the night of 14 May. The latter ended in a rout, as American automatic weapons stopped the attackers, killing 73 Japanese, marking the end of the battle. In the fighting for Colgan Woods and Maramag, the 124th Infantry lost 60 men and 120 wounded from 6 to 12 May. 641:
The final stages of the battle for Mindanao culminated with the 155th Infantry Regiment of Colonel Monaks J. Mungkamar occupying Malaybalay on 21 May and taking control of the Sayre Highway, together with the 108th Infantry Regiment of Colonel Maurice D. Stratta after a stiff fight with the Japanese. Morozumi's 30th Division continued their retreat up the Agusan Valley, after a vicious encounter with the pursuing 31st Division on 5 June, where they eventually made it into the jungle. 643 Farther south on Mindanao, smaller X Corps units seized Sarangani and Balut islands, situated off its southern tip, and on 12 July, the 1st Battalion, 24th Division's 21st Infantry arrived at the northwest shore of Sarangani Bay to reinforce a reconnaissance patrol, which located a strong Japanese force in the interior and proceeded to pursue the Japanese through the jungle. Japanese forces retreated into Klaja Karst in the municipality of Buayan (now General Santos City), where they made their last stand against mixed American forces and Filipino guerrillas that were operating in the area. Operations in these areas continued until mid-August, when American planes heavily bombed the land, resulting in large Japanese casualties. Some Japanese who have survived the bombings escaped to the forest, but were hunted down by the soldiers. The Japanese resistance in Mindanao was finally over. :646–647:
While mopping up operations by small American units and Filipino guerrillas continued for some time, General Eichelberger announced the end of organized Japanese resistance. Throughout Mindanao, pockets of Japanese troops, protected by the impenetrable terrain of the island's unexplored jungle expanses, survived until the end of the war, when some 22,250 troops and 11,900 civilians emerged to surrender. 647 That signalled the total liberation of the Philippines. Some 12,865 Japanese troops were killed, and another 8,235 appeared to have succumbed to starvation and disease. :647 The Americans lost only 820 men and 2,880 wounded for the entire campaign. :647:
The seemingly low cost in battlefield casualties for the Americans in the Mindanao campaign stemmed, aside from the overall brilliance and skill of the Eighth Army planners and leaders, from increasing assistance by Filipino guerrillas, which in military terms, constituted a valuable "force multiplier" for the Eighth Army units. Before landings, guerrillas harassed Japanese units, provided valuable intelligence about enemy dispositions and the relative suitability of landing beaches. And after each landing, the Filipinos fought alongside the Americans and pursued the Japanese through the island's interior.
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