Where do these ideas come from to perform such maneuvers? You suddenly appear in a weakly defended enemy castle in an open space, and the reaction to this is obvious. But you are performing some kind of maneuvers.
If you go immediately, you have too few troops and won't make it (there are either phoenixes or earth elementals).
Running away from the elf is tedious.
By maneuver, I meant capturing the upper city and then the unoccupied capital ("While the owner was away" J.R.R. Tolkien).