Camouflage

The level of camouflage makes it possible for some units not to be seen whereas they are in the zone of sight of other units. However, the impact of the camouflage depends on the distance between the two units and the range of sight. The more an unit has a high level of camouflage, the more it can approach other units without being seen.
The camouflage of a unit is substracted from the sight of the unit observing. Thus a marine with a sight of 10 (1 cell) will not see a unit with 10 of camouflage located on the same cell as it. A nonvisible unit cannot be attacked. A well camouflaged unit is also sensitive to the bombardment of its cell.

In our example:

Another example, more complicated: