Adding to this, I can certainly say that chapter 14 was extremely annoying, for merely the fact that you were almost forced to bring out all of your magic units, fliers and thieves just in hopes of navigating the map because of the Fog of War and reduced movement. However, to clear the air around the Sacae route, I believe that Chapter 14 is much more tedious, and challenging than Chapters 17b and 19b (respectively) solely because of the movement problem(s) paired with the fact that you may want the Divine Weapon to achieve the game's true ending, which is only possible in a certain turn limit. 17b and 19b will only need 1 thief (each) because of the normal movement over plains/floor and the rather predicatable amount/types of enemies due to the terrain/spacing of these chapters.