Definitely? No. However, certain units have an ability called "Paths seldom trod". All the native units have it, but so do Rangers or the faction equivalents of others. This makes the unit "harder to spot on the campaign map". I know I've made an army of all rangers, and once the army has been stationary long enough to be dug in, the graphic changes. The man that represents the army is no longer standing at attention, he's bent over like he's sneaking and looking around.