The 2153 hijacking of Enterprise NX-01 by D'Jamat and his Triannon followers, who believe the Delphic Expanse spheres are sacred and mean to use the ship in their holy war.
The Triannon seizure of Enterprise is told in the episode Chosen Realm. The crew rescue a group of Triannon pilgrims who revere the builders of the spheres as the Makers. Their leader D'Jamat then reveals that his people carry organic explosives in their bodies and takes control of the ship.
D'Jamat condemns the crew for scanning the spheres, has the data Enterprise has gathered on them erased, and demands that Archer pick a crew member to die. Archer names himself and uses the transporter, presented as a means of execution, to hide aboard.
With the help of the doubting Yarrick, the crew retake the ship as D'Jamat attacks his rivals, heretics who differ over how many days the Makers took to create the Expanse. Returned home, the Triannon find their world already laid waste by the war.