Here's how the droid snipers go in The Beginning of the Chronicles.
[Meanwhile, Percy is chuffing to the Canterlot Mail Station]
Percy: Thomas! What brings you here?
Thomas: I was asked to help you out with the Canterlot Mail Trains tonight.
Percy: Oh, thanks.
[But when they pull into the mail station, Thomas looked depressed]
Percy: Thomas? Is something wrong?
Thomas: It's about Nyx.
Percy: What about her? Did she get in trouble?
Thomas: No. It's not that. It's something else.
Percy: What is it?
Narattor: Thomas knew he couldn't keep Nyx's origins a secret from Percy. One of his closest friends.
Thomas: [sighs] Alright, I'll tell you, but you must promise not to tell anyone else, what I tell you.
Percy: I won't
Thomas: Nyx isn't really Twilight's half-cousin. Twilight actually found her in the Everfree Forest inside a thornbush.
Percy: Inside a thornbush?
Thomas: Yeah, but we have reason to believe that she was created by the Sith.
Percy: I hope she isn't one.
Thomas: Well, so far, there haven't been any signs that she could be, so she may not be a Sith.
Percy: I hope so. Such a sweet little foal shouldn't be a Sith.
[Then gun fires!]
[the shot hits a cart of Mailbags]
Percy: WE'RE UNDER ATTACK!!!
[the Royal Guards race in]
Royal guard: What is it?
Thomas: Gun shots! Over there!
Royal Guard #2: Come on!
[they race over to where Thomas pointed out, and draw thier lightsabers.]
[Then more shots arrived]
Royal Guard #3: There! [fires]
[then the droids fire back]
Royal Guard 1: [blocks it with his lightsaber]
[soon, it got destroyed]
Royal Guard #2: Check it out.
[they slowly approach the droid and see a Sith marking on it]
Royal Guard: A Sith Droid. The Sith is here!
Royal Guard #2: Tell this to Celestia at once, Percy! Thomas tell the situation, NOW!
Thomas: Yes sir! [he then races away back to the librabry]
[soon Percy reaches the main throneroom]
Percy: PRINCESS CELESTIA!!! PRINCESS LUNA!! KING SOLAR FLARE!!! BARRET BARRICADE!!! [whistles several times]
Princess Luna: Percy, would you kindly, not whistle so loudly? You might wake up Yuna and Sharon.
Percy: Sorry, but this is an emergency. Sith droids just attacked inside the Canterlot Mail Room just now.
Barret Barricade: Sith droids?
[the the Royal Guards carry in the destroyed droid]
Royal guard: It's true your majesty. This droid attacked Percy and Thomas just as they were picking up the mailvans.
Princess Celestia: Take this to the exam lab.
[the guards do so]
Princess Celestia: Percy, while you deliver the mail, keep your eyes peeled for anymore droids.
Barret Barricade: And make sure your guns are armed too.
Percy: Yes, your royalties. [whistles as he reverses out]
[At the librabry]
Thomas: [races inside]
Twilight: Thomas! You're back early.
Thomas: Twilight. [sighs deeply] I need to tell you something.
Twilight: What's wrong?
Thomas: Sith Droids just tried to attack me and Percy at the Mail station!
Twilight: Oh, no!
Thomas: I know! It had a Sith marking! And I think Nyx is involved with this.
Twilight: What?! How could you say anything like that?!
Thomas; I don't know. But we must keep our guard up high.
Twilight: [in her mind] I hope Nyx isn't involved with this. She doesn't desrve any of this.