Here's how the attack goes in Return of Darth Sidious.
[Then we see the smaller ships flying down to earth and they land]
[we then go to Mucker's workshop and he's working on the laser turret's final adjustments]
Mucker: There! I got it!
[then there's a strange sound coming from outside]
[everyone around looks outside]
[then we see walkers and robots controlled by pilots!]
Princess Celestia: The empire has returned!
[TIE Fighters come in and fire]
Civilians: [running and screaming as they fighters draw fire]
[then the team races out, (with their weapons ready)]
[the fighters then turn towards them and fire at them]
[But then the planes appeared and they began to shoot down the TIE Fighters]
[the team then start deflecting the laser blasts and fire at the TIE Fighters]
[Then, Darth Vader is there!]
Princess Celestia: Darth Vader.
Darth Vader: Princess Celestia. It's been a while. Princess Luna, how have you been keeping?
Princess Luna: It's been a thousand years.
Darth Vader: And look at your daughter, she's now a full grown mare.
Princess Luna: Yes, back then she was younger. But you will not gonna do anymore evilness to her.
Darth Vader: [evil chuckles] Not as this is gonna be. [activates his lightsaber]
Yuna: [draws her Lightsaber and activates it]
[the 2 clash their sabers]
Darth Vader: Impressive. Most impressive.
Yuna: I've learned the ways of the force I grew up.
Darth Vader: Then you are unwise to lower your DEFENSES!
[they clash their sabers at different angles]
[they then clash their sabers again and push against each other but they still in the one angle]
Darth Vader: [breathing]
Darth Sidious: Night filly!
[they deactivate their lightsabers and see Darth Sidious walking up]
Darth Sidious: Nice to see you! [zaps her]
Princess Luna: YUNA!!
Hiccup: [races in and blocks the Force Lightning with his lightsaber]
Darth Sidious: Foolish viking! [Force throws him]
Hiccup: WHOA!!! [he hits the ground] UH!
Darth Sidious: [evil laughs] Away with them! (he then picks up the other with the Force and throws them up and away]
Everyone: WHOA! AAAAAAAAAAAAAHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!
Rainbow: YOU JERK!!
Darth Sidious: Quiet! [zaps her]
Anna: STOP!! Can't at least show a little mercy here?!
Darth Sidious: There is no mercy. [zaps the royals, Mane 6, Blythe, and the godmothers]
Royals, Mane 6, Blythe, and the godmothers: [yelling in pain]
Darth Sidious: Do not worry, I'm not going to kill you. I have other plans for you. [cackles as he continues zapping them]