1963
March: BRN founded by Ustadz Haji Abdul Karim Hassan (also Abdul Karim Hassan or Ustadz Karim). The group developed close ties to the Communist Party of Malaya (CPM), tending toward a pan-Arab socialist ideology.
1968
PULO was founded in India by Kabir Abdul Rahman, a Pattani noble and Islamic scholar educated in the Middle East. The group's ideology focused on secular secessionism.
1984
BRN split into the BRN-Congress, BRN-Coordinate and BRN-Uran. The BRN-Congress was led by Jehku Peng and focused on military struggle. The BRN-Coordinate pursued political avenues in mosques under the leadership of Haji M and became the strongest of the three splinters.
1986
The GMIP was founded by Wae-Hama Wae-Yuso.
1989
Aug. 31: Payong Organization was founded, placing the PULO, BRN, BNPP and GMIP under central leadership.
1991
Payong Organization was renamed Bersatu.
1992
The New PULO group split off, forming a separatist group more focused on Islamic values led by Ar-rong Moo-reng and Hayi Abdul Rohman Bazo.
1995
Nasori Saesaeng (Awae Kaelae), Jehku Mae Kuteh (Doromae Kuteh), Nasae Saning and a handful of other Afghan fighters reconsolidated GMIP. Its roots were in rural areas.
Another splinter of PULO, called PULO 88, was created. The group was short-lived.
1997
July: When the Asian economic crisis hit Thailand, Bersatu gained traction among discontented Muslims in the southern part of the country.
September-December: PULO-led terrorist activities claimed the lives of 11 policemen and 14 civilians.
2001
Jan. 6: Bersatu terrorists in Yala detonated an explosive device at a hotel garage in Betong, near the Malaysian border. Five people were injured in the attack.
April 7: A series of three explosions were set off by Bersatu-related terrorists. The targets included a train station in Hat Yai, a gas storage facility in Songkhla and a hotel in Yala. One person was killed in the attacks and 50 were injured.
December: PULO and New PULO conducted attacks on five police checkpoints in Pattani, Yala and Narathiwat, killing five policemen and injuring a civil defense volunteer.
2002
July: Thai security forces attributed the deaths of 20 police officers to Bersatu-related murders over the past eight months.
2003
August: Thai security forces gunned down GMIP's Afghan-trained operations chief Nasae Saning and Mahma Maeroh.
2004
Jan. 4: A stepped-up insurgency was launched by Bersatu-connected separatists.
Jan. 5: Thai Prime Minister Thaksin Shinawatra declared martial law in Narathiwat, Pattani and Yala provinces. Defense Minister Thamarak Isarangura authorized Lt. Gen. Phongsak Aekbansingha to place six districts in Narathiwat, three districts in Yala and four districts in Pattani under martial law.
April 28: More than 100 insurgents, most just teenagers wielding machetes, attacked multiple police stations and military positions in Yala, Pattani and Songkhla. Five security personnel died in the pre-dawn raids. Dozens of the attackers holed up in the Krue Sae mosque in Pattani. The military raid on the facility killed 32, an operation later deemed to be an excessive use of force, increased unrest among Muslims.
Oct. 25: Protesters and security forces clashed in Tak Baiu, Narathiwat. Some 2,000 demonstrators agitating for the release of suspected terrorist supporters clashed with about 1,000 police. In the ensuing fighting, six people were killed, while others died from drowning while they were attempting to flee police. Another 80 people died after being arrested and suffering from heat stroke or being crushed in government vehicles.
December: Alleged Bersatu member Mukkata Kureng was killed by Thai security forces in Pattani.
2005
April 29-May 1: Insignificant by the mid-1990s, PULO held a reunification congress in Damascus, Syria, in 2005. They brought together leading PULO figures from Thailand, Europe and the Middle East to elect Tengku Bira Kotanila as president of the group.
Aug. 31: Southern insurgents set off three remote-controlled bombs in Sungai Kolok, near the border with Malaysia. More than a dozen were injured in the simultaneous blasts.
October: Representatives from the five main Muslim insurgent groups in Thailand met secretly with senior Thai military and intelligence officers in Langkawi, Malaysia, to develop a peace plan for southern Thailand. The conference was mediated by former Malaysian Prime Minister Mahathir Mohamad as well as members of his Perdana Global Peace Organization non-governmental organization. As of late 2006, those talks were said to be at a dead end.
November: The insurgency-related death toll, since ramped-up violence began in January 2004, reached 1,000.
2006
Aug. 31: Muslim militants conducted a series of small bomb attacks against 22 commercial banks across Yala province. The bombs were planted in ATM booths and detonated by remote timers over a 5-minute timespan. At least one person was killed by the series of explosions and dozens were injured. The attacks were timed to coincide with the 27th anniversary of the founding of Bersatu.
Sep. 16: Insurgents set off three bombs in the town of Hat Yai, in the province of Songkhla, killing at least two people and injuring more than 30. The devices, two of which were detonated at department stores and another placed near a hotel, were hidden in motorcycles and simultaneously detonated by mobile phones.
Sept. 19: Military leaders staged a bloodless coup, ousting Prime Minister Thaksin Shinawatra.
Nov. 19: Thai separatist groups reportedly received foreign funding during Ramadan (from Muslim donors in Egypt, Libya, Sweden, Indonesia and Malaysia) totaling $164,000 (6 million baht).
Dec. 11: Teachers in Narathiwat and Yala decided to suspend classes, shutting down nearly 1,000 schools in those two provinces and Pattani. Security concerns due to shootings and incidents of arson prompted the closures.
Dec. 21: Talks between military officials and insurgents (begun in 2005) were said to be stuck over the creation of an independent tribunal to try army officers for alleged human-rights violations and the granting of amnesty to all insurgents. Other accounts suggested new talks would be held in Brunei.
Dec. 23: Thai Army Chief of Staff Montri Sangkhasap said the army would deploy an additional 10 companies of paratroopers to Pattani, Yala, Narathiwat, Songkhla and Satun in January 2007, and 20 more companies in April, to combat the southern insurgency.
Dec. 31: Nine bombs exploded in the Thai capital of Bangkok, killing three people and injuring another 38. Thousands of people were driven home by the attaacks, and New Year's Eve celebrations were cancelled. The explosive devices were small time-bombs made with ammonium nitrate fertilizer and triggered by digital watches. Immediately after the attacks, authorities blamed supporters connected to ousted Prime Minister Thaksin rather than southern separatists.
2007
October: The Thai army changed its command structure in the south. The four southern states wre divided among the army's four regional commands. Previously, the Fourth Region had been in charge of the entire southern area.
Oct. 31: The Thai army announced plans to increase the number of troops deployed in the south. Some 30,000 were already deployed.
Dec. 23: Thailand held new parliamentary elections: The military junta disbanded shortly thereafter.
2008
December: New civilian government leadership took over from interim military rulers that came to power following a 2006 coup. The different approaches in combating insurgents did little to affect the instability in southern Thailand.
2009
June: Bersatu appeared to have lost much of its authority over the disparate insurgent networks, according to an assessment, dated June 21, 2009, by the U.S. Congressional Research Service.
Nov. 14: Bersatu joined other separatist groups in responding positively to a proposal to establish a specially administered Pattani City. Under the plan, the city would be granted a greater degree of autonomy.
2010
April: The Thai government, in a presentation to the U.S. military, mentioned the continuing presence of Bersatu. However, the government said other groups were now considered more significant in the insurgency.