Siege of Shuuyoujo
Star Wars: The Clone Wars x Naruto
As they're returning to Konoha after saving Gaara, Team 7 sees a strange flying device land outside the village (4 others land at each of the other major ninja villages). The men inside demanded to meet with the leaders. The officers demanded the immediate surrender and disarmament of all military forces. Only the officers from Konoha walked away alive. The Separatist invaders wanted to mine the planet's untapped resources, which it had an astounding abundance of, particularly cortosis ore.
In response to the killings, the cruisers in orbit bombarded the villages, slaughtering thousands. Next they jammed communications as they sent their droid armies. They expected the droids to easily route any survivors but they greatly underestimated the resolve, abilities, and fury of the warrior-class. The ninja banded together into an unprecedented alliance to repel the robots.
The siege lasted months, with more and more droids and weapons being brought in as factories and foundries were built, sabotaged, and destroyed. Eventually, the droid leader (Grievous) was forced to come and personally lead the assault. However, he was overconfident and unprepared, greatly underestimating the natives, which led to his capture. As they interrogated him, Republic Intelligence finally catches wind of the siege. They dispatch two Jedi to verify it.
They weren't expecting to find the world devastated yet the natives still fighting so passionately or the fact that the natives had found a new way to use the Force. They were quickly captured and interrogated by the paranoid natives. The Jedi were eventually able to negotiate their freedom by teaching them some basic Force powers and how to completely bring down the droids by destroying the power generator. But the ninja were also able to reverse-engineer the lightsabers taken from Grievous and the Jedi, learning how to build them for themselves.
Learning of Grievous's capture, Count Dooku finally and personally came to lead the end of the insurgency and rescue Grievous. He first made his presence known by leading a massacre of an innocent village to draw out the natives. Enraged, some of them took the bait and ended up getting captured. After an extensive and relentless interrogation, Dooku learned of their secret HQ. He leads a savage attack, freeing Grievous, and killing many ninja. Taking a last stand, Team 7 fights to grant the Jedi time to acquire a ship so they can flee the planet and come back with Republic reinforcements. Over the course of the battle, Naruto ends up fighting against Dooku, Sasuke against Grievous, and Sakura against a massive army of droids alone.
Pushing themselves to their max, they were able to actually kill Dooku and Grievous. Despite this tremendous victory, they were forced to retreat with the Jedi after they brought the ship over to them because of the overwhelming droid numbers. They (and a handful of ninja survivors) were taken with the Jedi to Coruscant where they were awarded honors to the Republics and proclaimed great heroes. All they wanted was their home back, but there was nothing left but ruins of their way of life. They were forced to find a new way to live in the galaxy as a whole.
Meanwhile, Sidious's schemes draw ever closer to fruition…