Hidden units

[Mowgli]

I was toying around with PzBattles lately, and I though I could write up my findings on concealment. Feel free to add your own or point out any mistakes. 

• Units in concealment (terrain of 1m height for infantry, 2m height for guns and vehicles) stay concealed as long as they don't move or fire. (digging-in is safe; formation changes are NOT) Use the opportunity fire dialogue to hold your fire and stay concealed.
  
• Note that units can stay concealed even if enemy units move adjacent to them!
  
• Hidden units cannot be "actively" targeted by enemy units in the enemy turn. (I suppose they are still hit by indirect fire which affects all units in the hex. Not sure if the *0.25% malus for indirect fire at an unspotted target applies against hidden units)
  
• Hidden units can become the target of actions that hit a random unit in a hex, i.e. by opportunity fire or air strikes - the hidden unit may suffer casualties if it is randomly selected as the target, but it will stay concealed (the opponent will see if the unit consists of men/vehicles/guns though, and also see the formation identity if he has "on map results" off). 
  
• If an enemy unit tries to move into a hex which contains hidden units, the opponent will be informed that he has triggered an assault (and opportunity fire may be triggered). He can still cancel the assault, in which case the units in the hex stay concealed.
  
• Hidden units do not affect your opponent's movement. I.e. the movement malus for moving from ZoC to ZoC does not apply if the unit exerting the ZoC is hidden.
  
• Hidden units cannot isolate the enemy (their ZoC is ignored).
  
• Hidden units are not revealed by the recon spotting ability.
  
• Can recon air missions reveal hidden units? [needs to be tested]