My new strike force was composed of Fillin the Nord Rogue, the Sarethi sisters Nathala and Nathyne, Okan-Shei the Argonian and Eydis the Quiet (a bard who doesn't sing). After gearing up (translation: me giving them gear) we traveled to the Thalmor Embassy with the simple objective of killing all the bastard invaders in a speedy night assault.
You have failed this hold!
The Thalmor are backed by their Imperial allies here in the form of Penitus Oculatus agents, and Nathala is vaporized by a wizard commander in the opening assault. Simply defeating the guards isn't enough to gain access though, so we need to get creative by finding alternate routes into the buildings via a nearby well - which happens to be inhabited by really strong zombies that devour Okan-Shei.
The underground tunnels do give us access to the Penitus Oculatus barracks though, where in the melee Nathyne is slain by the stationed Imperial General Calvus. My response to that was killing all his guys, then doing this.
And now he's a head shorter.