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Black September

Black September was an armed conflict in Jordan between the Jordanian government under King Hussein and the Palestine Liberation Organization (PLO), with its main fighting taking place in September 1970 and related violence continuing into 1971.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Black September was an armed conflict in Jordan between the Jordanian government under King Hussein and the Palestine Liberation Organization (PLO), with the main fighting taking place in September 1970 and related violence continuing into 1971. The term also refers to the later Palestinian militant faction Black September, formed in 1971, which carried out attacks outside Jordan.

Background

By 1970, armed Palestinian factions had a significant presence in Jordan and were increasingly in conflict with the Jordanian state. This growing confrontation led to a violent power struggle between King Hussein’s government and the PLO.

Conflict

The main fighting took place between 16 and 27 September 1970. Although the central phase ended quickly, instability and related military actions continued into 1971. A ceasefire was reached in late September 1970 during Arab leadership talks in Cairo.

Aftermath

The conflict weakened the PLO’s position in Jordan and contributed to the relocation of its leadership and fighters. The episode also shaped later Palestinian militancy, including the creation of the Black September Organization in 1971.

Legacy

Black September remains a major event in modern Jordanian and Palestinian history. It is remembered both as a civil conflict and as a turning point in the Palestinian movement’s regional strategy. The conflict is also associated with the international impact of the later Black September Organization, particularly the 1972 Munich Olympics attack, which affected global security policy.

Key facts

  • The conflict arose from escalating tension between Jordan and Palestinian armed groups operating in the country.
  • The main fighting occurred in September 1970, with later clashes and aftermath extending into July 1971.
  • The conflict is also referred to as the Jordanian Civil War.
  • A ceasefire was reached in late September 1970 during Arab leadership talks in Cairo.
  • The events helped drive the PLO leadership and fighters out of Jordan.
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Canadian context

Canadian readers may know Black September through its international impact, especially the 1972 Munich Olympics attack carried out by the later Black September Organization, which affected global security policy and public awareness of Middle East conflict.

Frequently asked questions

What was Black September?
Black September was an armed conflict in Jordan in 1970 between the Jordanian government and the PLO.
Who were the main leaders involved?
The conflict involved King Hussein of Jordan and the PLO led by Yasser Arafat.
Why is it called Black September?
The name refers to the violence that occurred in September 1970.
How long did the fighting last?
The main phase lasted from 16 to 27 September 1970, with related unrest continuing into July 1971.
Is Black September the same as the Black September Organization?
No. The conflict and the later militant organization are related, but they are not the same thing.
What happened after the conflict?
The PLO leadership and many fighters left Jordan, and the later Black September Organization was formed in 1971.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/Black_September
    Supports: Main conflict description, Jordanian Civil War alternative name, dates, parties, and aftermath.
  2. Encyclopaedia Britannicahttps://www.britannica.com/topic/Black-September-political-organization-Palestine
    Supports: Black September Organization, founding in 1971, objectives, and dissolution in 1974.
  3. UNRWAhttps://www.unrwa.org/content/black-september
    Supports: Conflict between the PLO and Jordanian Armed Forces and the movement of the PLO leadership from Jordan to Lebanon.
  4. Jewish Virtual Libraryhttps://www.jewishvirtuallibrary.org/black-september
    Supports: Ceasefire timing and events in Jordan being referred to as Black September.