This is especially true for the Sanctuary faction; they can walk on water if all the creatures in your army are amphibious (i.e., all Sanctuary troops are amphibious).
Ah, thank you. That's a good ability!
Another thing I'd like the developers to fix is the Autosave feature! Not only does it save the new, current turn (and not the previous one), but it also only uses one save slot (in Heroes 5, there were 3 autosaves, i.e., the 3 most recent days). The autosave in Heroes 6 is really inconvenient. I remember that in Heroes 3, the autosave was useful if, after a battle (and, for example, you didn't place your army in your castle), an enemy hero unexpectedly appeared and captured it! You could easily load the autosave and buy an army in the castle. In Heroes 6, you simply can't do that! It feels like the developers made the autosave in Heroes 6 only to protect the game from random crashes!