At some point in the main quest, a bit after you find Esbern, a large party of Thalmor will spawn and attack you. For me this happened when I was loitering around in the Cistern. I was GuildMaster, so I hang out there a lot.
About 6 Thalmor appeared by the secret entrance and went hostile to me. Within seconds every thief in the place was rushing them. Before I could even get my sword out, every Thalmor lay dead. No casualties to the thieves.
I have seen a lot of cool things in this game, but this one was by far the best yet. Also made me very very proud of my thieves.
