Long ago, two groups had a fight. 

Long ago, two groups had a fight. 


Between 1963 and 1966, a conflict took place in Southeast Asia. 
Indonesia's leader was Sukarno. 
In 1963, the new state of Malaysia was formed. It included Malaya, Singapore, and parts of Borneo. Indonesia sent people into the Borneo jungle to stop this. Most fighting happened near the border of East Malaysia.
The jungle was very thick. There were almost no roads. Soldiers had to walk long distances on foot. They also used rivers and helicopters to move.
Britain, Australia, and New Zealand helped Malaysia. They used many troops to defend the area. Eventually, the fighting began to slow down. In 1966, both sides signed a peace deal. 
The Indonesia–Malaysia confrontation was a period of conflict from 1963 to 1966. 

Most of the fighting happened near the border of East Malaysia on the island of Borneo. The terrain was a very thick jungle. There were almost no roads in the border areas. Because of this, soldiers had to go on long foot patrols. Both sides used light infantry for their operations. They also used rivers for transport and infiltration. The Commonwealth forces used helicopters to move supplies to their bases.
Before the war, Indonesia had a major diplomatic victory in 1962. They gained control of Dutch New Guinea after a campaign of airborne and seaborne moves. This success made Indonesia feel like a major regional power. In 1961, the UK proposed a federation called Malaysia. This plan included Malaya, North Borneo, Sarawak, Brunei, and Singapore. Indonesia initially felt okay about this idea. However, the Communist Party of Indonesia strongly opposed the plan.
In December 1962, a revolt happened in Brunei. 
As time passed, the situation in Indonesia changed. A coup d'état happened in October 1965. 

The Indonesia–Malaysia confrontation, also called the Borneo confrontation, was an armed conflict from 1963 to 1966. 
To understand the conflict, one must look at the political situation in Indonesia. President Sukarno wanted to establish Indonesia as a major international power. He pursued an independent foreign policy that was distinct from the major global powers. In 1962, Indonesia achieved a diplomatic victory regarding Dutch New Guinea. They gained control of the territory after a campaign of airborne and seaborne infiltrations. This success likely emboldened Indonesia to challenge the British proposal for a unified Malaysian state. 
The proposed state of Malaysia was a federation of several territories. The plan included the Federation of Malaya, North Borneo, Sarawak, Brunei, and Singapore. 

Most of the military action occurred on the island of Borneo. The border area between Indonesia and East Malaysia was difficult to navigate. The terrain consisted of thick jungle and high ridgelines reaching 2,500 metres. There were almost no roads in the Fourth and Fifth Divisions of Sarawak. Because of this, both sides relied on long foot patrols and light infantry operations. Rivers were also used for transport and infiltration.
The combat was characterized by low-level brinkmanship and isolated ground operations. Most actions were conducted by company- or platoon-sized units. Both sides utilized air transport to move troops and supplies. However, Commonwealth forces had an advantage in helicopter deployment. They used these helicopters to resupply forward operating bases more effectively. 
In 1964, the British launched a covert response called Operation Claret. This operation involved launching secret missions into Indonesian Kalimantan. Operation Claret was successful in gaining the initiative for Commonwealth forces. It kept the Indonesian forces on the defensive. Later in 1964, Indonesia launched an expanded campaign into Peninsular Malaysia. This followed President Sukarno's announcement of a "year of dangerous living." Despite this, the Indonesian campaign in the peninsula did not achieve military success.
The conflict began to subside due to political changes within Indonesia. A coup d'état occurred in October 1965. This event led to President Sukarno losing power to General Suharto. With the change in leadership, the intensity of the fighting decreased. Serious peace negotiations between Indonesia and Malaysia began in May 1966. 
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