A group of young officers attempted Nigeria’s first coup, assassinating key political leaders and ending the First Republic’s civilian government, although the plotters did not ultimately consolidate control nationwide.
Major General Johnson Aguiyi-Ironsi, the army’s commander, assumed power as Head of the National Military Government in the wake of the failed coup, marking Nigeria’s first period of centralized military rule at the federal level.
A mutiny and counter-coup by largely northern officers began in late July, targeting the Ironsi government and helping trigger wider political violence and military fragmentation.
Lieutenant Colonel Yakubu Gowon announced he had taken control of the federal government after the July mutiny/counter-coup, formalizing a new military leadership and shifting Nigeria’s political balance.
A faction of officers overthrew General Yakubu Gowon while he was abroad, installing Brigadier Murtala Mohammed as head of state and accelerating promises of reform and a transition timetable.
An attempted coup led by Lieutenant Colonel Bukar Suka Dimka assassinated Head of State Murtala Mohammed in Lagos; the coup failed, and his deputy Olusegun Obasanjo succeeded him.
After overseeing a transition program, military head of state Olusegun Obasanjo transferred power to elected President Shehu Shagari, inaugurating the Second Nigerian Republic and ending the 1966–1979 military era.
The armed forces ousted President Shehu Shagari, ending the Second Republic. Major General Muhammadu Buhari became head of state, returning Nigeria to military rule.
Chief of Army Staff Ibrahim Babangida overthrew Buhari, replacing the ruling structure with a new Armed Forces Ruling Council and launching a prolonged, tightly managed transition program.
After a foiled coup plot against the Babangida government, the regime carried out executions of convicted officers, reflecting persistent intra-military instability during the period of junta rule.
Major Gideon Orkar and other officers attempted to overthrow Babangida, seizing radio facilities and attacking key sites in Lagos; loyalist forces defeated the uprising.
Following trials for the April coup attempt, the government executed Major Gideon Orkar and dozens of co-conspirators, underscoring the harsh penalties used to deter further military rebellions.
Nigeria held a presidential election—widely regarded as a pivotal step toward civilian rule—but the results were annulled during the Babangida transition, triggering a major political crisis.
Babangida stepped aside and Ernest Shonekan became interim head of state, leading a short-lived transitional administration amid legitimacy disputes and ongoing military influence.
General Sani Abacha removed the Interim National Government and restored overt military rule, beginning one of Nigeria’s most repressive junta periods.
After Abacha’s sudden death, General Abdulsalami Abubakar was sworn in and initiated an accelerated transition plan that set a firm timetable for elections and handover.
Abubakar transferred power to elected President Olusegun Obasanjo, inaugurating the Fourth Republic and ending the 1966–1999 era of repeated coups and extended military rule at the federal level.
Nigeria: Military Coups and Rule (1966–1999)
