Forests are a terrain feature in Wargame to allow most units to conceal themselves. When a NATO unit goes in to a forest they appear blue or green while a PACT appears red or orange with their icons blinking, signifying that they are hidden
Units will only see enemy units at point blank range unless if the unit is sitting on the edge of a forest, in which they can have an excellent view on the open area ahead whilst staying hidden from most units. Most of them however, will turn visible once firing their weapons.
It is sometimes best to move your command vehicles into a forest that is inside a zone, allowing it to be concealed from enemy units and having more protection. Careful though, if it is the only forest patch in the command sector, experienced player will blind-bomb it.
When your recon units can't find the proper location of enemy units in a forest, it is best to drive them out using artillery or the fire position ability.
Never send an expensive unit into the heart of a forest-Everyone's firing range will be reduced to what is practically a point blank range; if your IFV/tank encounters infantry at such range, it will be reduced to scrap in seconds.
Also, always watch out for infantries sneaking up from behind for the same reason.