- WAFF Gombe Expedition, March 1902 — Lt-Col Thomas Morland's column takes Gombe Abba; Emir Umaru deposed, Tukur installed. Casualty figures unrecorded on the Gombe side.
- Forced-labour requisitions for the Bauchi Light Railway (1912–14) — Gombe Emirate supplies thousands of labourers; mortality from dysentery and beriberi documented in the Bauchi Province Annual Report for 1913.
- 1929 anti-tax protests, Tangale-Waja district — the Kaltungo highlands refuse the 1928 direct-taxation extension; District Officer reports note "passive resistance" but no shootings. (Same year as the Aba Women's War in the east — see the National Protests register.)Impunity Loop
Gombe State · Crisis deep dive
Era 0 — Conquest & colonial (1900–1960)
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.