Just can't work this out

[=MERCS=Firestorm*]

Hi Gents,

I have a problem that I just can’t solve. I have been at this for over a week and it's driving me nuts.
 

The attached test map shows a capturable airfield, objectives and artillery. What I need is the artillery to fire on the objective once the airfield has been captured by the other faction and then deactivate after the objective has been completed. In other words, I don’t want the artillery spawning on mission start and want it gone after it/players done their job.

 

Currently, the artillery spawns once the airfield has changed to the opposite faction, i.e. allies to axis,  but I can’t get the artillery to deactivate once the objective has been completed, so it continues to fire on a dead objective.
 

I have used some trigger logic from Sketch but getting it to work with what I am currently using is in the way of objectives and bases is frustrating.

Can anyone help me work this put please?

ArtTest12Final.zip

[Sketch]

Video explaining the things:

 

Mission File:

ArtTest12Final_Edited_By_Sketch.zip

 

[=MERCS=Firestorm*]

Thanks so much for your help with this Sketch, it was driving me crazy.