Ramas continues, looking a bit puzzled by your elven whispers, "I myself have wondered the same thing. The humans under the employ of the bard, the true threats to us, are always the ones on these six guard spots. More interestingly every caravan we have ever observed has a covered wagon or two. The other carts we can see are general supplies, foods, ales, tinkerer parts, weapons, but the covered wagons we have never been able to gain intelligence on what is inside of those"
Ramas shuffles through the papers that have started cluttering the table and finds a rolled up scroll, he unfurls it and you see what look like diagrams of a covered wagon of sorts. Instead of the canvas roof it looks more like a carriage, having a large wooden roof over the back of the wagon. Diagrams show a set of double doors on the back with two bolts across it.
"We know something of high importance is on these wagons, but we've never been able to discern their origin, and we have never seen them opened. This, however, is also going to be our best bet at getting into the fortress. Once inside we know they do not check this at any point along the route. We just need a diversion to be able to get into one."
GM: I'm going to assume you muttered under your breath in common since you specified after that you spoke in elvish.