1) In Orberg's LLPSI Cap XLIV (simplified Livy) Orberg is describing the division of Roman men into Centurias.
Having described the prima classis he goes on to describe the secunda as follows:
Additae huic classi duae fabrum centuriae, quae sine armis stipendia facerent.
He's saying that added to this first class was this second class but why is it all in genitive case? Aren't they the object of the sentence?
--- unless duae is fem ...