Thanks to Titler i remembered how i did it ones...
I've played through one of the esiest = the first level
, saved JUST before the final castle was burned (...or just before there was any knights in it..).
Then hex-edited the save... *somewhere* ...
... and ...
...voila!
Here i am in the final mission, with the land from that easy (mentioned above) mission, and just after few secs the castle burned down... and me is a winner (alias:
CHEATER! 
) watching the ending scroll-screen...
Can't say that i'm proud of that... but i was young and dumb... ... ...and now i'm just older...