Stargate: how the Ori crushed the Milky Way fleet at P3Y-229

The Battle of P3Y-229 was the first major engagement between the Ori and the combined forces of the Milky Way in Stargate, and it was less a battle than a slaughter. The fleet that met the Ori was the best hope the galaxy had, and it failed. The Tau'ri were left to fight on almost alone.

Stargate is one of the series I'm weaker on in terms of lore. I love the series, but I'm not as knowledgeable on it as I am on Star Trek, Star Wars or Battlestar Galactica, so I've tried to do more research than usual.

The Ori and the second supergate that opened the Milky Way

The Ori are ascended human beings with godlike powers who lived in a galaxy far from the Milky Way. Once they realized humans existed in the Milky Way, they began building huge fleets to attack and subjugate the people living there. For various reasons outside the scope of this battle, those early attempts largely failed.

That changed when the Ori built a second supergate linking the Milky Way with their home galaxy. Supergates are huge constructions based on the much smaller Stargates. A Stargate only lets people or objects travel through it, but a supergate lets ships cross vast distances. A common Ori tactic was to build a supergate and use the area around it as a foothold for an invasion.

We aren't completely sure how the second supergate was built. The first one encountered was made up of 90 individual ships linked together, and it needed matter converted into a singularity to operate. There's no evidence the second gate was powered the same way, and its segments were much larger. I think it's more likely the Ori found another source to power it.

Ori warships: a primary beam, pulse weapons and up to 500 fighters

A note before the ships. Some of the weapons I list may not have been available on these ships at the time of the battle, especially on the Milky Way Alliance side. I haven't seen the full series, and I have reason to believe some of the Asgard weapons weren't available yet. But I haven't found a source proving they weren't on the ships, so I'm naming them anyway.

The Ori warship was one of the most technologically advanced vessels the Milky Way had ever seen. It carried a primary beam weapon, pulse weapons and up to 500 Ori fighters. The primary beam was one of the most devastating weapons around. Only the most advanced technology could resist it without having its shields drained completely and the ship destroyed. One of the ships fielded against the Ori could not withstand a single hit.

The beam needed a brief recharge between shots, but it didn't take many shots to destroy even the Alliance's most advanced ships. To cover the other angles, pulse weapons were spread across the hull. They were much less powerful than the main weapon but could still do huge damage: a standard Ha'tak could take only six shots before its shields were gone.

Ori fighters handled scouting, air support and defense. They were armed with a cannon and were much easier to destroy. Like their weapons, the Ori warships' shields were among the most powerful known. Even ramming them would not breach the shields. It would take weapons of the Ancients or the most powerful Asgard weapons to get through.

The Milky Way Alliance fleet: 13 Ha'taks, an O'Neill class ship and two BC-304s

The combined force, which I like to call the Milky Way Alliance, brought together the Tau'ri, the Asgard, the Tok'ra, the Jaffa and the Lucian Alliance. It fielded 13 Ha'taks, one O'Neill class ship and two BC-304s.

The Ha'tak class ships were the weakest in the fleet and close to useless against the Ori. Each carried 60 staff cannons, a powerful cannon based on the technology of the staff weapon. They were superb for ground assaults and against lesser races, but they became among the weakest weapons around, since even Tau'ri shielding could repel them. The Ha'taks also carried naquadah bombs, death gliders armed with mounted staff cannons, and Al'kesh bombers with two staff cannons, plasma charges and a cloaking device.

The O'Neill class ship was the most advanced vessel in the Asgard fleet, with four ion guns. Upgraded Asgard technology was among the most powerful in the Milky Way, and few ships could survive a direct assault from it. Asgard shielding could withstand attacks from even upgraded Ha'taks.

The BC-304, also known as the Daedalus class warship, was a deep space carrier built and maintained by the Tau'ri and one of the most advanced designs in their fleet. It carried four Asgard plasma beam weapons. Unlike other beams that use pulses, this weapon fires superheated plasma that overloads shields and devastates the enemy ship. The Daedalus class also had 32 rail guns, 16 VLS missile tubes, nuclear missiles and a weapons platform.

The battle: Ha'taks destroyed outright as the Ori beams cut through

After the attempt to deactivate the supergate failed, four Ori warships streamed out of it. The Ori transmitted a cryptic message from the Book of Origin, the religious text of the Ori themselves. In response, Dr. Daniel Jackson transmitted a different verse right back.

The Ori then powered their weapons, and the Allied fleet opened fire. The Alliance was no match for the Ori ships. Most Alliance vessels took heavy damage from the main beam weapon, and the Ha'taks were destroyed outright when hit. Even Asgard technology, thought to be some of the most powerful around, was only barely protecting its ships against the onslaught.

The Alliance tried to swarm the Ori, attacking from all sides to find a weakness while staying out of the path of the main beam. It was no use. At the start, only the Tau'ri and the Asgard faced the Ori. The Lucian Alliance arrived, but late, and even with that backup every ship was cut to ribbons, with very few left drifting and disabled.

Why the Ori left survivors drifting

The Ori ships had the capability to destroy every opponent, yet they left some behind. We can't be sure exactly why, but the most reasonable explanation was to spread fear among those who had survived the battle. The Ori then moved on to try to convert the rest of the Milky Way.

A military and political defeat that left the Tau'ri alone

The loss was not only a military disaster but a political one. The forces of the Milky Way would never unify again, and the Tau'ri ran into problems with both the Lucian Alliance and the Jaffa. They were effectively facing the Ori on their own, after their entire alliance of ships could not win the battle. This was their best hope and it failed miserably, and from then on they were left to fight the Ori, for all intents and purposes, alone.