A THREAD FOR NEWCOMERS!

Hey guys, I have 2 noob questions, and I couldn't find the answers in the game (maybe I didn't look closely enough?). 1. For example, I'm playing as a hero and enter a dungeon. Right away, there's a group of archers standing there, and I don't want to fight them. There's nowhere to move. How do I get back to the surface? I've seen it in streams and let's plays countless times – they just stand in the doorway and go back. 2. How does the type of terrain affect movement speed? Let's say I have a hero, Adele (from a Castle), I hire her in a tavern, give her 1 Gnoll, and send her into a swamp. Will the fact that she has a unit that's native to that type of terrain (the Gnoll) affect her movement speed? Or does the hero's movement speed only depend on stables, roads, whether the terrain is native or not for the hero, and the speed of the slowest unit in the army?