Next was Grog Hills, Fort Zeakden and Yuguo Woods. Party in those three battles were Samurai Ramza, Lancer, Ninja, Mustadio (first and third), Summoner (second) and Wizard.
If not having Mustadio in the first battle, only if you take too long to reach the opposing forces that you can have any problem. Actually, I think that battle might be difficult not to win.
Fort Zeakden was fairly ok due AoE spells taking down all ninjas at once, but not before being able to steal one of the swords. Sadly, I ended up damaging Malak too much and couldn't steal any of his equipments. All in all, the battle was easy all thanks to the Wizard. Having my Summoner almost had no use, actually. If it was Mustadio, Boco or Agrias, it might have been much faster.
Yuguo Woods was ok, although it started dragging on a bit when people started returning from the dead, at least those who weren't petrified or poached.
I'm now about to go to Riovannes Castle, which ignites in memory at least 2 tough battles. I think you first choose from where you storm the castle, north or south. Then you face Wiegraf ... then Belias; and then that roof battle.
Another map that it glitches is the southern Swamp, but it might be related to emulator, as you said.