How u make a trigger units move from a place to another

Level 7
Joined
Jan 13, 2008
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248
like i have for example 10 mountain trolls and i want the trolls move from an area to another are when my hero move into an area like my hero go to area 1 then the trolls moves from area 2 to 3 like that.
 
Level 17
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Aug 13, 2007
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