All castles in Heroes 3.

Regarding the trench. In the Castle, mines are removed by an expert Dispel Magic. It takes a lot of level.

Sorry, I don't get it at all. How can a spell remove "a lot of level"?!:confused: Do you think the hero loses levels?
Dispel Magic removes all blessings and curses (i.e., all the nasty things and bonuses caused by spells) affecting units. It doesn't seem to work on mines:eek: And anyway, which castle are you talking about? Knights don't have mines; only wizards do; but Castle (with a capital C) is the city of knights. The city of wizards is the Tower.

The trench in the Stronghold is even worse. If you stand on the trench by the wall and don't make a move (forward, backward), then health doesn't seem to be deducted.

Oh, it definitely gets deducted! I've won so many battles thanks to that:rolleyes:

By the way, I'm curious how exactly you won the battle. There are plenty of options...