TD - How to move units again if after being stunned

Hi, my question is "how can i trigger a movement" after a unit is stunned.

For example: I order my unit xxx to move to region1 on the way to it. The unit is stunned by a tower. After that "stunned" it stops moving. In this case i must order that unit to move again.

Well it can be enroot,stunning or something else too. Just the case a unit is not attacking or moving.

How can i handle/trigger that event?