Well, you can tell some Eagles that "there is a very important mission to go on with Gandalf, and we need some eagles who don't know why we're going on the miss

Well, you can tell some Eagles that "there is a very important mission to go on with Gandalf, and we need some eagles who don't know why we're going on the mission." Like, you could have the Army move a box of stuff for you, and tell the army, but still have none of the soldiers know what's in the box.