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Warfare in jungles, forests, or similar environments

Jungle warfare or woodland warfare is warfare in forests, jungles, or similar environments. The term encompasses military operations affected by the terrain, climate, vegetation, and wildlife of densely wooded areas, as well as the strategies and tactics used by military forces in these situations and environments. The jungle has a variety of effects on military operations. Dense vegetation can limit lines of sight and arcs of fire, but can also provide ample opportunity for camouflage and plenty of material with which to build fortifications. Jungle terrain, often without good roads, can be inaccessible to vehicles and so makes logistical supply and transport difficult, which in turn places a premium on air mobility. The problems of transport make engineering resources important as they are needed to improve roads, build bridges and airfields, and improve water supplies. Jungle environments can also be inherently unhealthy, with various tropical diseases that have to be prevented or treated by medical services. The terrain can make it difficult to deploy armoured forces, or any other kind of forces, on a large scale. Successful jungle fighting emphasizes effective small unit tactics and leadership. Jungle warfare has been the topic of extensive study by military strategists, and was an important part of the planning for both sides in many conflicts, including World War II, the Vietnam War, and the Nicaraguan Revolution.

Throughout world history, forests have played significant roles in many of the most historic battles. For example, in the Battle of the Teutoburg Forest between the Romans and the Germanic tribes in 9 CE, the Germans used the forest to ambush the Romans. In ancient China, the Chinese Empire planted forests on its strategic borderland to thwart nomadic attacks. For example, the Northern Song Dynasty (960 1127) constructed and maintained an extensive defensive forest in present day Hebei. In the Amazon rainforest, there were fighting and wars between the neighboring tribes of the Jivaro. Several tribes of the Jivaroan group, including the Shuar, practised headhunting for trophies and headshrinking.

At the start of Pacific War in the Far East, the Japanese Imperial Forces were able to advance on all fronts. In the Malayan Campaign, time and again they infiltrated through the jungle to bypass static British positions based on road blocks so that they could cut the British supply line and attack their defences from all sides. In early 1942, the fighting in Burma at the start of the Burma Campaign took on a similar aspect and resulted in one of the longest retreats in British military history. Most members of the British Indian Army left Burma with the belief that the Japanese were unstoppable in the jungle. The Chindits were a special force of 3,500 that in February 1942 launched a deep penetration raid, code named Operation Longcloth, into Japanese occupied Burma. They went in on foot and used mules to carry supplies. The operation was not a military success but was a propaganda boost for the Allies because it showed that Allied forces could successfully move and fight in jungle terrain well away from roads. On the back of the propaganda success, Orde Wingate, the eccentric commander of the Chindits, was given the resources to increase his command to divisional size and the USAAF supplied the 1st Air Commando Group to support his operations. The availability of air transport revolutionized Wingate's operational choices. In February 1944, Operation Thursday was launched, and air transport support supplied 1st Air to allow the Chindits to set up air supplied bases deep behind enemy lines from which aggressive combat patrols could be sent out to interdict Japanese supply lines and disrupt rear echelon forces. That in turn forced the Japanese 18th Division to pull frontline troops from the battle against X Force, which was advancing through Northern Burma, to protect the men building the Ledo Road. When the Japanese closed on a base and got within artillery range, the base could be abandoned and then set up in another remote location. The ability to sustain the bases that relied totally on air power in the coming decades would prove a template for many similar operations. After the first Chindits expedition, thanks to the training the regular forces were receiving and the example of the Chindits and new divisional tactics, the regular units of the Fourteenth Army started to get the measure of both the jungle and the enemy. When the Japanese launched their late 1943 Arakan offensive they infiltrated Allied lines to attack the 7th Indian Infantry Division from the rear, overrunning the divisional HQ. Unlike previous occasions on which this had happened, the Allied forces stood firm against the attack and supplies were dropped to them by parachute. In the Battle of the Admin Box from 5 February to 23 February, the Japanese were unable to break through the heavily defended perimeter of the box. The Japanese switched their attack to the central front, but again, the British fell back into defensive box of Imphal and the Kohima redoubt. In falling back to the defensive positions around Imphal, the leading British formations found their retreat cut by Japanese forces, but unlike previously, they took that attitude that the Japanese who were behind them were just as cut off as the British. The situation maps of the fighting along the roads leading to Imphal resembled a slice of marble cake, as both sides used the jungle to outflank each other. Another major change by the British was that use of air support both as an offensive weapon to replace artillery and as a logistical tool to transport men and equipment. For example, the 5th Indian Infantry Division was airlifted straight from the now quieter Arakan front up to the central front and were in action within days of arriving. By the end of the campaigning season, both Kohima and Imphal had been relieved, and the Japanese were in full retreat. The lessons learnt in Burma on how to fight in the jungle and how to use air transport to move troops around would lay the foundations of how to conduct large scale jungle campaigns in future wars.

Immediately after the fall of Malaya and Singapore in 1942, a few British officers, such as Freddie Spencer Chapman, eluded capture and escaped into the central Malaysian jungle, where they helped to organize and train bands of lightly armed local ethnic Chinese communists into a capable guerrilla force against the Japanese occupiers. What began as desperate initiatives by several determined British officers probably inspired the subsequent formation of the above mentioned early jungle warfare forces. The British and the Australians contributed to the development of jungle warfare as the unconventional, low intensity, guerrilla style type of warfare understood today. V Force and Force 136 were composed of small bodies of soldiers and irregulars, equipped with no more than small arms and explosives but were rigorously trained in guerrilla warfare style tactics, particularly in close quarters combat, and fought behind enemy lines. They were joined in Burma by American led Kachin guerrillas were armed and coordinated by the American liaison organisation, OSS Detachment 101, which led, armed, and co ordinated them. Another small force operating in the Far East was the Australian led Z Special Unit, which carried out a total of 81 covert operations in the South West Pacific theatre, some of which involved jungle warfare.

After the war, early skills in jungle warfare were further honed in the Malayan Emergency, when in 1948 guerrilla fighters of the Malayan Communist Party (MCP) turned against the Commonwealth. In addition to jungle discipline, field craft, and survival skills, special tactics such as combat tracking (first using native trackers), close quarter fighting (tactics were developed by troopers who were protected only with fencing masks and stalked and shot each other in the jungle training ground with air rifles), small team operations (which led to the typical four man special operations teams) and tree jumping (parachuting into the jungle and through the rain forest canopy) were developed from Borneo's native Iban people to actively take the war to the Communist guerrillas, instead of reacting to incidents that were initiated by them. Of greater importance was the integration of the tactical jungle warfare with the strategic "winning hearts and minds" psychological, economic, and political warfare as a complete counter insurgency package. The Malayan Emergency was declared over in 1960, as the surviving Communist guerrillas were driven to the jungle near the Thai border, where they remained until they gave up their armed struggle in 1989.

In the 1960s and early 1970s, Portugal was engaged in jungle warfare operations in Africa against the independentist guerrillas of Angola, Portuguese Guinea and Mozambique. The operations were part of what is collectively known as the "Portuguese Colonial War". In fact, there were three different wars: the Angolan Independence War, the Guinea Bissau War of Independence and the Mozambican War of Independence. The situation was unique in that small armed forces, those of Portugal, conducted three large scale counterinsurgency wars at the same time, each in a different theatre of operations and separated by thousands of kilometres from the others. For those operations, Portugal developed its own counterinsurgency and jungle warfare doctrines. In the counterinsurgency operations, the Portuguese organized their forces into two main types, the grid (quadrilha) units and the intervention units. The grid units were each in charge of a given area of responsibility in which they were responsible to protect and keep the local populations from influence from the guerrillas. The intervention forces, mostly composed of special units (paratroopers, marines, commandos etc.) were highly mobile units that were used to conduct strategic offensive operations against the guerrillas or to temporary reinforcing grid units under heavy attack.

The British experience in counterinsurgency was passed onto the Americans during their involvement in the Vietnam War, where the battlegrounds were again the jungle. Much British strategic thinking on counterinsurgency tactics in a jungle environment was passed on through BRIAM (British Advisory Mission) to South Vietnam headed by Sir Robert Thompson, a former Chindit and the Permanent Secretary of Defense for Malaya during the Emergency. The Americans further refined jungle warfare by the creation of such dedicated counterinsurgency special operations troops as the Special Forces (Green Berets), Rangers, Long Range Reconnaissance Patrols (LRRP), and Combat Tracker Teams (CTT). During the decade of active U. S. combat involvement in the Vietnam War (1962–1972), jungle warfare became closely associated with counter insurgency and special operations troops. However, although the American forces managed to have mastered jungle warfare at a tactical level in Vietnam, they were unable to install a successful strategic program in winning a jungle based guerrilla war. Hence, the American military lost the political war in Vietnam for failing to destroy the logistics bases of the Viet Cong and the Vietnamese People's Army along the Ho Chi Minh Trail. With the end of the Vietnam War, jungle warfare fell into disfavor among the major armies in the world, namely, those of the U. S. led NATO and the Soviet led Warsaw Pact, which focused their attention to conventional warfare with a nuclear flavor that was to be fought on the jungleless European battlefields. American special operations troops that were created for the purpose of fighting in the jungle environment, such as LRRP and CTT, were disbanded, and other jungle warfare proficient troops, such as the Special Forces and Rangers, went through a temporary period of decline until they found their role in counterterrorism operations in the 1980s.

The end of the Soviet Union in the early 1990s marked the beginning of the end of a number of proxy wars that had been fought between the superpowers in the jungles of Africa, South America, and Southeast Asia. In the euphoria at the end of the Cold War, many Western nations were quick to claim the peace dividend and reinvested resources to other priorities. Jungle warfare was reduced in scope and priority in the regular training curriculum of most conventional Western armies. The nature of major military operations in the Middle East and Central Asia saw the need to put an emphasis upon desert warfare and urban warfare training in both the conventional and the unconventional warfare models.

The Counter Insurgency and Jungle Warfare School (CIJWS) located in Vairengte, Mizoram, India, is the primary jungle warfare training center for Indian forces.

The Jungle Warfare Training Center (CIGS) in Brazil is the primary jungle warfare training center for Brazilian forces. They seek to copy the capacities of units of homologous commands.

The Jungle Operations Training Center (JOTC) located at Schofield Barracks in Oahu, Hawaii is the primary jungle warfare training center for American forces. Opened in its present rendition in 2013, JOTC is operated by the 25th Infantry Division and primarily trains personnel of the 25th Infantry Division, special forces, and foreign partners. Hawaii was chosen as the location for JOTC due to its climate, geography, capacity, and operational history in jungle training within the Pacific. Jungle warfare training is not new to this organization in Hawaii or the United States. During World War II the JOTC, also known as the Pacific Combat Training Center, was established in Hawaii to teach soldiers survival and fighting skills in tropical environments. Over 300,000 U. S. military personnel were trained in jungle fighting prior to deploying throughout the Pacific. Between 1956 and 1965, this same installation in Hawaii was home to the Jungle and Guerilla Warfare Training Center followed by the Recondo School from 1971 to 1979. The U. S. Asia Pacific Rebalance Strategy necessitated jungle warfare training for the U. S. military be increased in priority. JOTC's revival at its original location in Hawaii is in part due to closure of the Fort Sherman, Panama JOTC location in 1999. Another jungle warfare training center, Camp Gonsalves, is operated by the United States Marine Corps on northern Okinawa Island, Japan.