GravityWave
Deposed Emperor
Sorry, but do we run the counter esp. on the ai's citys or the one we want to protect?
Against the AI. So, you might have to perform the mission against multiple AIs depending upon how many EP's they have against you.
I personally have never used the Counter Espionage mission more than twice. I instead adjust the priorities on the Espionage Screen constantly throughout the game. As the game develops it is usually pretty obvious who your main competitors are going to be and by focusing EPs this way I can usually prevent all but the occasional farm from being destroyed.