Why Moria?

[CSteefel]

Originally Posted by Eönwë

As well as other reasons mentioned, I think that this would also be useful because if they didn't know exactly where they were going, then it would be much harder for anyone else to know where they were going and ambush them there.

Yes, with also the implication that the obvious routes should be suspect--the northern Route, the Gap of Rohan, and the Redhorn Pass. Moria strikes me as a route nobody would have predicted...