There is one Brettonian Regiment of Renown, I forget it's name, but it's an archer unit based on Robin Hood. This suggests that some peasants would work as mercs. Perhaps the Bretts wouldn't hire any mercs at all, but at least a few mercs would be available to other races in the territory, for whatever reason. Also, I like my idea for limited Wood elf mercs, so I will continue to suggest that.