The first military intervention in Nigerian politics occurred in the year 1966. This intervention marked a significant and drastic shift in Nigeria's political landscape. Prior to this, Nigeria had functioned as a parliamentary democracy after gaining independence from British colonial rule in 1960.
In January 1966, Nigeria experienced its first military coup, which was led by a group of army officers. These officers were dissatisfied with the political climate at the time, which was characterized by alleged corruption, ethnic tension, and political instability within the civilian government.
During the coup, several political leaders, including the Prime Minister, Sir Abubakar Tafawa Balewa, were assassinated. This coup ultimately led to the suspension of the constitution and the end of the First Republic, paving the way for military rule in Nigeria.
The consequences of this intervention were far-reaching, as it started a series of coups and counter-coups in the years that followed, profoundly impacting Nigeria's political history and development. The military would go on to rule for many years, with brief interruptions by civilian administrations, until the eventual return to civilian rule in 1999.