Great Enlightenment

"Great holy armies shall be gathered and trained to fight all who embrace evil. In the name of the Gods, ships shall be built to carry the warriors out among the stars and we will spread Origin to all the unbelievers. The power of the Ori will be felt far and wide and the wicked shall be vanquished."

- Doci

The Ori crusade was the holy war that the Human followers of the Ori waged against the races of the Milky Way to convert the galaxy to Origin.

The beginning
The crusade began at the Battle of P3Y-229. At the activation of the Supergate, the Ori Army sent four Ori battlecruisers through it as a first wave. It battled two 304s, one O'Neill-class ship, and a fleet of Ha'taks from both the Free Jaffa Nation and the Lucian Alliance. However, their efforts were unsuccessful, as the Ori shields were too powerful for their weapons to pierce. When the battle ended, Vala Mal Doran, on one of the ships, gave birth to her daughter Adria, and learned that she was Orici, an Ori in human form intended to let the Ori lead the Ori army without enticing the Ancients

After leaving the system, the Ori fleet travelled to Chulak, since the world was the first to denounce the Goa'uld. One ship landed planet side to launch a ground invasion, while the other three remained in orbit. Bra'tac brought three ha'taks to try and defend the planet, but they were destroyed. SG-1 and Bra'tac were rescued by the Odyssey, which had followed them once its hyperdrive was repaired, and Vala and Daniel Jackson (who escaped the Korelev's destruction by ringing to an Ori mothership) were also beamed aboard, saving them from a Prior which attempted to kill them. Over the next week, the Ori conquered six more worlds, including two Jaffa strongholds.

Further confrontations
In a plan to seal the Supergate, SG-1 travelled to Atlantis to cause a jump with a black hole, as well as locate the Sangraal, a weapon Merlin built to kill the Ori. While there, Daniel Jackson met the Ascended Ancient Morgan Le Fay, who told him of Merlin's intentions, and that she had taken the Sangraal and hid it on one of three worlds: Castiana, Sahal, and Vagonbrei. However, the Others prevented Morgan from telling him anything further. The plan to cause the jump eventually worked, and also resulted in the destruction of both an Ori battlecruiser and a Wraith Hive-Ship.

Suffering massive losses, the Free Jaffa, under Se'tak, used the Dakara Superweapon to destroy the crew of an Ori battlecruiser. Adria retaliated by destroying the weapon and devastating Dakara, fracturing the Free Jaffa Nation, thus removing the only organized military force that could effectively combat them.

Eventually, SG-1 and the System Lord Ba'al discovered the location of where Morgan hid the Sangraal. After discovering Adria in their midst, they were transported to a planet where they learned that Morgan had destroyed the Sangraal, but hidden the real prize: Merlin, held in a stasis pod so that he could one day rebuild the weapon. Merlin agreed to help them, but his body had aged to much while in the pod, and he transferred his memories to Daniel Jackson. Daniel built two phases of the device, but Adria found where they were and captured Daniel and the weapon. Adria believed that she converted Daniel to Origin and made him a Prior of the Ori, but Merlin's conciousness was able to protect him. He made contact with SG-1, and convinced them and Jack O'Neill to shut down the Supergate so that he could send the weapon through. They succeeded, and but the Ori army regained control of the Supergate, sending another six ships into the galaxy.

SG-1 set a trap for Adria, but it was ruined when Ba'al kidnapped her and took her as a host. With the help of the Tok'ra, they removed Ba'al, but he released the symbiote toxin into Adria. Dying, Adria ascended.

When the Asgard realized that they were unable to repair the defects caused by their constant use of cloning, they decided to commit mass suicide and leave their technology and knowledge to the Tau'ri. The new weapons are capable of piercing the shields of the Ori battlecruisers. With this new technology, the Tau'ri are now a potential threat to the Ori fleet.

End of the crusade
The crusade finally ended with the Ark of Truth, with a win for the humans of this galaxy. Morgan Le Fay began directing Daniel through dreams to search for the Ark of Truth, and Ancient device that will force the followers of the Ori to beleive the truth about them. SG-1 searchs the ruins of Dakara for it and apparently find it when they are captured by Tomin and his forces. SG-1 convince Tomin of the truth by killing the Prior he's with (the Prior disruptor is secretly blocking his powers) and he helps them figure out that the Ark is likely in the Ori galaxy. Also the team learns that the Ori may now be coming after Earth. In an attempt to stop this, the team and Tomin takes the Odyssey to the Ori galaxy through the Supergate to find it and stop the Ori forces.

There they found out that the Ori are indeed dead but Adria has taken all of their power and is planning to concur the universe and destroy the Ancients. The IOA tries to implement a plan to use the Replicators to destroy the Ori forces but things go bad until Colonel Carter manages to trigger a self-destruct in the Replicator forces. The crusade finally ends when Daniel, Teal'c and Vala activate the Ark forcing the Ori followers in the Ori galaxy to realize the truth severly diminishing Adria's power. Morgan Le Fay engages her in battle and the two apparently destroy each other. SG-1 takes the Ark back to the Milky Way where they use it to convince the Priors of the truth there as well ending the crusade.

Ori-related conflicts

 * Battle of Kallana
 * Battle of Tegalus
 * Battle of P3Y-229
 * Battle of the Black Hole
 * Battle of the Asgard Legacy
 * Battle in the Alteran Home Galaxy
 * Tau'ri-Ori skirmishes