Battle to destroy Anubis' mothership

"Our goal is to take out Anubis' new super weapon. It's what gives him a clear advantage over the rest of the Goa'uld mother ships. Now, we've received word from Teal'c that Yu has pledged to bring the full force of the remaining system lords' fleet down on Anubis once we've succeeded."

- Samantha Carter

The Battle to destroy Anubis' mothership was a series of confrontations with the Tau'ri, the System Lords and the forces of Anubis, taking place in 2003, resulting in the destruction of Anubis' mothership.

Prelude
Earlier in 2003, Anubis attacked Abydos in search of the Eye of Ra to power a new superweapon on his mothership. After a brief battle and, Anubis tricked the (then ascended) Daniel Jackson and SG-1 into handing over the Eye. After they did, Anubis quickly destroyed the planet with his now fully powered superweapon.

After that encounter, Anubis quickly decimated the united fleet of the System Lords who had gathered to stop him. After he destroyed the System Lords, the Tauri feared he would soon attack Earth, so a plan was devised to disable Anubis' superweapon, thus ending his dominance over the rest of the Goa'uld.

Meanwhile in the SGC, Jonas discovered what he thought to be the Lost City of the Ancient in a city called Vis Uban on another planet. Soon after that, SG-1 arrived on that planet and quickly discovered it was not the lost city, but the city of the lost. Upon this discovery, the team found Daniel Jackson on the planet.

The Battle
Once in orbit around the planet, he deployed his soldiers to find details on the Lost City but found out it was a trick orchestrated by the Tau'ri who infiltrated his mothership and used one of their F-302s to attack a weak point in the flagships power core which destroyed the power source.

This resulted in the loss of Anubis's chief advantage over the other Goa'uld but he managed to learn from a captured Jonas Quinn of a powerful variation of Naquadah that was located on his homeworld. To that end, Anubis travelled to the Human world in order to conquer it and use the planet's ore to refuel his motherships superweapon. However, he was thwarted in his attempts at securing Thanos's research by SG-1 who managed to convince Lord Ba'al to attack Anubis's mothership whilst it was in the atmosphere of Kelowna. His mothership was destroyed but not before Anubis managed to retreat in his escape craft.

Aftermath
After the loss of his flagship, Anubis rebuilt his mothership, which led his fleet to attack Earth in order to capture the Lost City of the Ancients. After arriving in the system, he probed the planet's defenses and attempted to capture the Ancient outpost at the planet's Southern Pole. However, his plan was thwarted when Colonel Jack O'Neill activated the Ancient weapon platform in the Antarctic outpost, firing a massive swarm of Ancient drone weapons that destroyed his fleet.