Fort Isen

Fort Isen was the Insurrection base on Bellaphron.

Analysis
Isen is a primarily underground base, hidden from the public. The base was eventually found by the UNSC, where they sent in Eclipse team to destroy it and the Insurrection movement in a whole.

Destruction
The base was attacked when Eclipse team was sent to destroy it in the chapter Stirring the Embers of the War for Bellaphron. The base was destroyed by Eliezer Sai, who detonated C12 that was planted all around the base. The UNSC ultimately succeeded, capturing all the info they needed, and destroyed Isen, and most of the Insurgents there.

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