you could always make a trigger...
create 1 dragoon at (location) for player(1,2,3..ect)
that will create the dragoon for the players   
Players: 
(1,2,3..ect)
Conditions: 
Commands exactly 0 dragoons(ur unit that gets banned) 
Actions: 
Defeat for current player 
 Preserve trigger
Try it 

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This is exactly what element nature said, except you dont have to create the units in the game, just have them there to start it, make them in the map editor, which you can see he already did!