Bajoran assault vessels approach Deep Space Nine as part of a military coup against the Bajoran government led by the xenophobic movement "The Circle". Sisko announces that he is evacuating the station's civilian population and anyone who wishes to leave; the entire crew volunteers to stay with him and fight. Li Nalas calms the flood of civilian passengers by inspiring courage in his fellow Bajorans. Quark ends up left on the station when a scheme to make money buying and selling seats on the evacuation ships backfires.

Once the Bajoran forces arrive, there is no sign of Federation presence; however, General Krim suspects Federation personnel are still aboard. Coup leader Jaro Essa orders Krim to capture Li Nalas alive, convinced that he can bribe Li into joining the Circle. Krim's soldiers begin a search of the station; security chief Odo uses his shape-shifting abilities to help the crew avoid detection.

Kira and Dax are sent to bring evidence that the Cardassians are backing the Circle to Bajor. Dropped off on a moon where the Bajorans stored a number of small starfighters during the occupation, they manage to get one of the craft working and fly to Bajor. Their ship is shot down by Bajoran fighters and they crash.

Sisko and the crew trap a group led by Krim's second-in-command, Colonel Day, in a holosuite. Sisko informs the soldiers about Cardassian involvement with the Circle and releases Day to pass the information to Krim, but the colonel instead tells Krim that the Federation is attempting to wrest control of DS9 from the Bajorans. A scan for Federation communicator signals reveals that they are hiding in the conduits, and Odo informs Sisko that the soldiers intend to flood the conduits with gas. Part of the crew distracts the bulk of the Bajoran forces, after which Li and Sisko capture Krim in an attempt to reason with him.

Although Kira was injured in the crash, Dax gets her to Vedek Bareil's monastery. She and Kira disguise themselves as clerics to travel to the Chamber of Ministers. Once there, Kira confronts the ministers with proof of Cardassian involvement. Upon learning of the Cardassian involvement, Krim gives control of DS9 back to Sisko and goes down to Bajor to resign. However, Colonel Day attempts to assassinate Sisko in revenge; Li Nalas steps in the way of Day's weapon blast and is killed; Day is put under arrest. Later, Sisko tells Chief O'Brien that Li was a hero of the resistance and that is the way he will remember him.

The episode includes many guest stars, in addition to the regular Deep Space Nine cast.^[1] This includes Rosalind Chao, Max Grodenchik, Aron Eisenberg, Hana Hatae, Philip Anglim and Louise Fletcher appear in their recurring DS9 roles; guest actors include Steven Weber as Day, Richard Beymer as Li, Stephen Macht as Krim, and Katrina Carlson as a Bajoran officer.^[1] Frank Langella makes an uncredited guest appearance as Jaro in this and the preceding episodes, according to Winrich Kolbe, he requested to be uncredited because he was appearing on the show as a gift to his children, rather than for money or exposure.^[1]

In 2015, Geek.com recommended this episode as "essential watching" for their abbreviated Star Trek: Deep Space Nine binge-watching guide, they noted that this episode is part of a trilogy that includes the first three episodes of the second season,^[2] ("The Homecoming", "The Circle", and "The Siege").

In 2018, SyFy recommend this episode for its abbreviated watch guide for the Bajoran character Kira Nerys, as a trilogy with the preceding two episodes.^[3]

"The Siege" and "Invasive Procedures" were released on VHS together in the U.K. on one cassette tape (catalog number VHR 2719).^[4]

On September 17, 1997, "The Siege" and "Invasive Procedures" were released on LaserDisc in the United States.^[5] Released by Paramount Home Video, the 12 inch optical disc used both sides for a runtime of 92 minutes with the shows.^[5]

It was released on LaserDisc in Japan on June 6, 1997 as part of the half season collection 2nd Season Vol. 1, which had seven doubled sided 12" discs. ^[6] The discs had English and Japanese audio tracks.^[6]

On April 1, 2003 Season 2 of Star Trek: Deep Space Nine was released on DVD video discs, with 26 episodes on seven discs.^[7]

This episode was released in 2017 on DVD with the complete series box set, which had 176 episodes on 48 discs.^[8][9]

• "The Siege" at IMDb  
• The Siege at Memory Alpha
• "The Siege" at Wayback Machine (archived from the original at StarTrek.com)