[ ] "We sneak in under the cover of night." Just do to reach the oubliette what you did to gather in this room, each of you breaking out of their own cell then making their way down individually until you can meet up, trusting in stealth and the Chateau's inability to watch all of itself.
Good 'ol reliable "just sneak over when no one's looking" - except we've already, by meeting all together here, drawn its attention. Admittedly, just to this room rather than to
us, but still.
I'd expect this to get us and most of our crew to the oubliette - but I suspect we'll have probably have one crewmember who gets caught or otherwise incapacitated on the way there.
[ ] "We start another riot." This time it won't be aimless and directionless, it will serve as the big distraction to draw all the guards to the courtyard and hide a coordinate push to the dungeons. Give the Chateau a hundred things to be more worried about than you.
Probably the most effective way to go, if we want to get everyone down there intact - but mostly because we're offloading some of the danger to us on the rest of the prisoners. I am not down for this. Seriously, "spending the lives of others to benefit ourselves" is not something we want to get into as a habit.
It would be one thing if it was part of an organized plot, where the other prisoners knew what they were the distraction while we went to kill the heart of the Chateau, but that's not our option here. And giving out enough info to get informed volunteers would probably just get us caught ahead of time.
[ ] "We break out of the higher dungeons." The Wardens will expect you to be causing trouble over the fate of your friend; use that. Make them send you for a time-out in the usual cells, from which the strongest of you can break everyone out and find yourself right next to your target.
I expect this will get us all in, but with injuries, missing equipment, etc. But consider: this is the option where we get to start off by declaring we will cause problems on purpose.
[X] "We break out of the higher dungeons." The Wardens will expect you to be causing trouble over the fate of your friend; use that. Make them send you for a time-out in the usual cells, from which the strongest of you can break everyone out and find yourself right next to your target.
"It is a beautiful day in the Chateau, and you are a horrible prisoner"