Sierra Leone (SLE)West Africa, AfricaMarch 21, 1967
Event Summary
On March 21, 1967 Brigadier David Lansana, commander of the Sierra Leone army, seized power hours after Siaka Stevens had been sworn in as prime minister, arresting Stevens and the governor-general to block the first electoral change of government in independent black Africa. The March 17 general election had been narrowly won by Stevens's opposition All People's Congress over Prime Minister Albert Margai's Sierra Leone People's Party, and after four independents dissociated themselves from the SLPP, Governor-General Sir Henry Josiah Lightfoot Boston swore Stevens in on March 21 before final results were announced. Lansana, an ethnic Mende and a Margai appointee and ally, disagreed, insisting the outcome should await the election of paramount chief representatives to parliament.
He sent troops under officers including Hinga Norman to State House, where they arrested the governor-general and Stevens at gunpoint without resistance; Lansana then took the radio and television stations, declared martial law, annulled the results, and assumed the position of head of state. Clashes between the army and APC supporters in Freetown reportedly left dozens dead. Lansana's overreach was repudiated two days later by senior officers, the companion event of March 23.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: Prime Minister Siaka Stevens, sworn in hours earlier and arrested by Lansana's troops on March 21, 1967, then placed under house arrest along with Governor-General Sir Henry Josiah Lightfoot Boston.
RESEARCHED NAME
Key figures
Siaka Stevens (newly sworn prime minister, arrested)
Henry Josiah Lightfoot Boston (governor-general, detained)
David Lansana (army commander and coup leader)
Albert Margai (defeated prime minister whom Lansana had backed)
Sources
On March 21, although official results had not yet been announced, Governor-General Henry Josiah Lightfoot Boston summoned Stevens and swore him in as prime minister, and the coup occurred after the inauguration; Army Commander David Lansana ordered the extrajudicial arrest of Stevens and the Governor-General, overseen by officer Samuel Hinga Norman, then took control of the Government House and national radio and television, annulled the election results, declared martial law, and assumed the position of Head of State.
SOURCE REVIEWEDWikipedia, 1967 Sierra Leonean coups d'etatopen source ↗
Stevens was sworn in as Sierra Leone's third prime minister on 21 March 1967, and mere hours after he took office soldiers stormed the State House and abducted Stevens at gunpoint in a coup led by Brigadier David Lansana, an ethnic Mende and commander of the armed forces who had been appointed by and was a prominent supporter of Albert Margai; Lansana declared a state of emergency and martial law, insisting the winner should await the election of the tribal representatives in Parliament.
SOURCE REVIEWEDWikipedia, Sierra Leone (1961-1971)open source ↗
A US Embassy history records that in closely contested March 1967 elections the APC won a plurality, the Governor General declared APC leader and Freetown Mayor Siaka Stevens the new Prime Minister, and within a few hours Stevens and Margai were placed under house arrest by Brigadier David Lansana on grounds that the determination of office should await the election of the tribal representatives to the house.
SOURCE REVIEWEDUS Embassy in Sierra Leone, Policy and Historyopen source ↗
A scholarly account records that on St Patrick's Day 1967 Sierra Leone went to the polls, that four days later on 21 March Brigadier David Lansana, head of the army, seized power, and that, unlike some coups, Lansana within minutes of taking power sent troops to fire on protesting crowds in the streets of the capital, before being repudiated two days later on 23 March.
SOURCE REVIEWEDCartwright, Elections and Coups in Sierra Leone 1967, Journal of Modern African Studiesopen source ↗
Editorial Note
Paired record care: this March 21 record is Lansana's coup deposing the newly sworn PM Siaka Stevens; the companion record 1967-03-23 is the NRC counter-coup that deposed Lansana two days later, and the two are distinct dataset events. Fate coding: Stevens and the governor-general were placed under house arrest (the dataset's fate for this record); Margai was also detained. Significance flagged: the March 1967 election was the first time an incumbent party lost an election at the ballot box in independent sub-Saharan Africa outside white-ruled states, and Lansana's coup cancelled that peaceful transfer. Sources note dozens reportedly killed in Freetown clashes; that figure is attributed, not asserted as precise.
Cross-Reference
Datasets agree. At least two of the three reference datasets we check against carry this event, and none of them disagrees about its date or its result.
Identifiers for finding this same event in the other datasets:
Coup Atlas research identifies the target as: Prime Minister Siaka Stevens, sworn in hours earlier and arrested by Lansana's troops on March 21, 1967, then placed under house arrest along with Governor-General Sir Henry Josiah Lightfoot Boston..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; placed under house arrest. The baseline file does not name individual targets; researched names are kept in a separate layer.
Baseline Dataset Citation
Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
“Army in Sierra Leone Detaining Newly Inducted Prime Minister,” March 22, 1967
“SIERRA LEONE CALLS EX-CHIEF A TRAITOR,” September 26, 1968
This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →