Skills in the game

Each faction has its own combat style, determined by the initial conditions (starting troops + heroes). Fortress can function effectively without archers, just like Dungeon and Rampart; Castle relies on a combination of archers and pikemen. It's the combination that matters, not just archers alone. And don't forget about "feeding" your units by letting them take damage from enemy heroes.
I didn't find Fortress particularly easy to manage while playing. Who would teach me?