[Warnevada]

Besides size what controls whether a unit is spotted or not?

The reason I ask is, I hit the following situation. There were three size 1 rifle units in a hex. One was visible the other two were not. All three were firing from the hex and it took several rounds of firing before the other two became visible. So why was the one visible at the start of the turn but the other two were not?

Related question: size 0 scout units behave differently in different battles. In many (most?) if they move adjacent to an enemy unit they get spotted and fired at. In some they are able to move adjacent and not be spotted. In the current battle, they not only can move adjacent but can fire for several rounds without being spotted. What makes for the different behavior?