<human>:  When did the Armed struggle in Nigeria start?
<bot>: The Nigerian Civil War started in 1967 and ended in 1970. It was a war between the northern-based military government and the southern-based separatist group called the Biafran Republic. The conflict was triggered by the secession of the Republic of Biafra from the Federal Republic of Nigeria. The war was characterized by massacres, mass rapes, and famine. It ended when the Nigerian military defeated the secessionists in 1970.