Shortly after independence, most Africans states faced serious political challenges, some of which resulted in civil War. Chad was one of them.  It was a protracted struggle for power and control of the Central government between its northern Muslims and the Southerns Christians. At a time the Chadian conflict degenerated into a struggle for power among the Muslims factional dissident leaders. The civil war attracted foreign powers intervention. They included France, Libya, US, USSR, Sudan, Egypt, Zaire, Nigeria as well as the OAU. Nigeria’s Intervention in the Chadian conflicts derives from the security implications the civil wars have on her, judging by her proximity with the warring Chad. Nigeria and the OAU made several attempts to reconcile the Chadian warring factions but to no avail. This study examines the causes of the Nigeria/Chad border clash of 1983, and its security challenges on Nigeria. The study employs the primary and secondary methods of data collection, as well as visitation to important institutions that have relevant materials and information to the success of the research. Arising from the method used, the results of the research shows that the Chadian civil war has far reaching security implications on Nigeria. Among others, the war shook Nigerian’s security strength by the loss of its military men. In the process of her intervention in the conflicts, Nigerian farmers in the Lake Chad region were not spared. From the results, the study concludes that Nigeria’s involvement in African conflicts, and its porous and unmanned borders with troubled African neighbours are sources of the many security challenges that threaten the corporalite existence of the Nigerian state. The study therefore recommends that Nigeria’s involvements in African troubled states should be checked to avoid the loss of gallant officers on whom much has been spent to train. Nigeria’s borders should be tightened to avoid the deluge of refugees from warring African states.

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