I'm building out a large scale encounter, where the PCs are helping townsfolk defend themselves against an attack by mercenaries. I'm using the class leveled NPCs detailed in the Core rulebook, namely the Warrior and Commoner NPCs, but the CR rules for NPCs don't make much sense to me. The rules say that the NPCs CR is their class level -2, but this would mean that a level 1 commoner and a level 1 warrior both have a CR of -2, or 1/3. It seems to me the warrior NPCs should have a higher CR. Does this sound right?