This is how Umarak attacks the fleet goes in Sideswipe's Sirenix.
[They see an old warehouse]
Twilight Sparkle: That warehouse is Umarak's new base.
[Shining Armor steps forward]
Shining Armor: We'll send our patrols.
Twilight Sparkle: And lose the element of surprise? I am in command here, brother.
Shining Armor: Twily, what's gotten into you? You don't seem like yourself.
Umarak the Hunter: Everything is going according to plan.
[Umarak pushes a button]
Umarak the Hunter: [offscreen] Fire!
Royal Guard: Ship carrying Optimus, Bulkhead, Ratchet, Bumblebee, Smokescreen, Arcee, Applejack, Fluttershy, Rarity, Pinkie Pie, Rainbow Dash, Princess Celestia, and Princess Luna sends imparative urgent priority one no kidding call off attack! And can they come aboard?
Twilight Sparkle: They live?
[Twilight groans as the Element of Magic flares up on her head]
Twilight Sparkle: Impossible. Another Umarak trick. Destroy the interceptor.
[The guard nods]
[Multiple pegasus guards are dispatched]
[Shining Armor leads the unicorn guards]
Shining Armor: Increase magnification.
[They do so]
Shining Armor: Identification positive. Rescue teams stand by.
[The other guards nod]
[Meanwhile, Umarak and two Shadow Spawns watch]
Shadow Spawn #2: A complication?
Shadow Spawn: Ninety-six percent probability this discovery will only confuse the Autobots more.
Shadow Spawn #2: And our defenses will still force them toward the detonator.
Umarak the Hunter: And once they are in range...
[Umarak watches and a simulation of the explosion happens]
Umarak the Hunter: ...there can be no escape.