[@Jb], it seemed like elementary deduction to me. We’re deep in the Reik and who, other than Elves, could pass so cunningly unnoticed through lands patrolled by Imperial soldiers? You also made the Beastman forces sound considerable so I find it highly unlikely that this is the first rumour to have been heard. Thirdly, and perhaps most important, Roderick made his deduction based on the information gained from other Sigmarites, learned men who would actually have education as to the enemies Men face. Simple deduction, my dear Watson.