So I had a very strange experience that no information I could find on the internet could explain. I've searched the forums here and couldn't find anything directly relevant (so my apologies if this has been asked before and I missed it). I'm currently doing a 'losing campaign' play-through of WC1 (i.e. so I can play all the series you miss if you win all the time). I met the full victory conditions for Brimstone 1 & 2, but in order to lose the series I am not killing the Dorkir in Brimstone 3 (provided I can retreat from it before Maniac kills it).
Now in trying to accomplish this, my aim was to get 8 kills (i.e. 2 Jalthis & 6 Krants) then get back to base, while keeping Maniac alive. However, on one of my attempts Maniac died before I could kill all the Krants, so I went back to base with the 8 kills (leaving the Dorkir alive) just to see what would happen. Of course I get dressed down by the Colonel for failing the mission (he didn't care about Maniac dying lol), however for my failures I am rewarded with both a Bronze Star and a promotion!