- Chadian civil war spillover (1965–1985) — successive waves of refugees and FROLINAT/FAN/FANT fighters cross Lake Chad; Nigerian Army deploys to Baga and Marte; cross-border raids by Hissène Habré's forces.
- Maitatsine sect activity in Maiduguri (1982) — after Kano (1980), Muhammadu Marwa's followers regroup; the 26–29 October 1982 Bulumkutu uprising in Maiduguri leaves c. 3,350 dead (federal commission of inquiry figure) — the bloodiest Maitatsine episode after Kano. Pattern: religious-political violence.Unprosecuted Massacre Cycle
- Bakassi Boys-style militias and the Lake Chad fisheries disputes (early 1980s) — armed clashes between Nigerian and Chadian fishermen on the receding lake.
Borno State · Crisis deep dive
First & Second Republics — Maitatsine and Chad spillover (1960–1985)
Methodology
Tier 1 · primary
Courts. Gazettes. National archives.
Tier 2 · corroborating
OCCRP. HRW. BudgIT. TheCable.
Tier 4 · tertiary, flagged
Wikipedia only where primary is pending. Always labelled.