1973
July: The OLF was founded partly to engage in armed struggle against the Marxist-Leninist regime of Lt. Col. Mengistu Haile Mariam -- the Dergue -- that overthrew Emperor Haile Selassie in 1974.
1989
June: The OLF claimed it destroyed five prison camps and freed more than 2,000 Oromo prisoners.
1991
Following the defeat of the Mengistu regime in Ethiopia in 1991, the OLF joined with the Ethiopian People's Revolutionary Democratic Front (EPRDF) in a transitional government that would lay the groundwork for elections.
1992
After a brief association with EPRDF and the Tigray Peoples' Liberation Front (TPLF), the latter of which was instrumental in overthrowing the Mengistu government, OLF separated itself. TPLF's forces later crushed the OLF and took 18,000 militia prisoners. Just prior to elections in mid-1992, the OLF and other parties pulled out of the voting process following disputes over the encampment of military personnel and claims of harassment of party members.
1996
July: The OLF and the Ogaden National Liberation Front signed political and military agreements.
1997
May: Informal negotiations between the OLF and the government broke down, causing a split within the OLF. The group's Secretary-General Gelassa Dilbo favored a continuation of the struggle against the regime while deputy Lencho Letta sought to legitimize the OLF.
August: OLF leaders met in Germany to consider a negotiated agreement with the government.
November: The government arrested 100 suspected members of OLF, charging them with participating in bomb attacks.
1998
April: The OLF reorganized its political structure and adopted a more militant leadership.
2000
The OLF and six other factions formed the United Oromo Liberation Forces, an umbrella organization for seven Oromo groups. That coalition never gained traction.
March: A truck from neighboring Kenya struck an OLF mine, killing 14 people. The mine was probably intended for an Ethiopian target. The OLF also detonated a small explosion in the Ethiopian Railway Commission in the Southeastern town of Daire Dawa, killing 14 people.
October: Somali warlord Hussein Aideed agreed to disarm and expel OLF fighters from Somalia in exchange for an Ethiopian withdrawal.
2002
June: The OLF claimed it had killed more than 300 government troops as the group intensified its violent activities.
The OLF claimed responsibility for a bomb attack at Dire Dawa, which killed 14 people.
2004
June: The OLF said it killed 10 government soldiers at two sites in southern Ethiopia. At least three other minor bombings were attributed by the government to the OLF. The OLF denied involvement in those incidents.
November: The OLF released a statement indicating it was willing to engage in a dialogue with the government. The statement stopped short of rejecting violent activities.
2005
Mar. 7: About 50 armed men attacked a Kenyan security force patrol near the border with Ethiopia, wounding four policemen. The attackers were believed to be from OLF.
May: The OLF rejected the results of parliamentary elections, claiming that the outcome was manipulated. Despite strong support in some areas, parties representing Oromo constituencies failed to gain control of the government.
May 23: Three civilians were killed in the town of El Hadi in Kenya's Eastern province by suspected OLF members.
May 26: Assailants believed to be members of OLF killed two people in an attack on the village of Idido in Kenya's Eastern province.
May 31: Suspected OLF militants killed seven people including a child and three police reservists, and wounded five others in El Hadi, in the Eastern province of Kenya.