- May 1966 — Anti-Igbo killings in Hadejia and Gumel as part of the wider Northern pogroms; an unknown number of Igbo traders killed and the Sabon Gari quarters of both towns burnt.
- Sept–Oct 1966 — Second wave; Igbo flight from the Hadejia–Kano railhead.
- 1967–70 — Hadejia, Dutse and Gumel are rear-bases for 2 Division under Murtala Muhammed during the Biafran War; no fighting on Jigawa soil but heavy conscription and food requisitioning.
Jigawa State · Crisis deep dive
Era I — First Republic & first military period (1960–1979)
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.