Heroes of Might & Magic III: Horn of the Abyss

cool, the screenshots are quite nice =)

Added 2 minutes later
as far as I understand, in the improved Factory, a dwarf with a cannon is produced; I think such a unit is unnecessary because this is "Heroes of Might and Magic," and if you add such a beefy guy with a cannon, it will no longer be heroes but something like Warhammer.