Unit Player back to guard distance

[ninehell]

Hi, i am making map where enemy unit guard entrace to fight final boss. i tried to set this unit that belongs to (for example team 10 light blue color) to guard the gates by setting it target acquistion become camp 200 but it seems it chase other unit and did not returned to its camp position. any solution to make this unit back to camp position like neutral unit does?

 

[chasin225]

event: unit leaves region
condition: unit type = gaurd
action: right click (to the postion he must go back to)