How to make creeps not retreat from towers?

[Legacyspy]

I have a map which use neutral hostile units as the primary enemy, however, when they get to half health, if they are being attacked by a structure they run away. I would rather them continue to attack it instead. What can I do?

 

[jig7c]

event
a unit is attacked
condition
owner of (attacked unit) equal to (neutral hostile)
action
order (attacked unit) to attack (attacking unit)

 

[malfy]

you could remove their ability to flee

 

[HydraRancher]

jig that wont work for a rapid tower - the unit will look like its spastic.