Well its kinda the opposite actually. Ackbar has realisation of a trap against his own forces and takes the defensive, Legolas acknowlages that they are going to trap Sauron's forces in an offensive (well kind of a trap anyways).
I dont quite understand what your looking for, are you just looking to pin point films where people state the blantanly obvious?
Just consider, if Akbar and Legolas had no made those statements, would the same effect and realisation be provided for the viewer? Despite stating the obvious, both statements make the whole thing much more dramatic.