Prima via

[john abshire]

Romani quattour ex eius urbibus prima via iunxerunt.
Four romans joined with the first road out of that town.
??
the four Romans were joined by the first road out of that town.
(Edit; second attempt)
i couldn’t find an accusative noun, and “with the first road” fit, and prima via being ablative fit, but I can’t find this in my textbook. I figure there is a rule somewhere?
It doesn’t seem to be an ablative of means.

 

[MIB]

I don't think quattour goes with Romani. Quantitative descriptors normally precede what they describe. It might be the accusative if used substantively.

 

[Pacifica]

Quantitative descriptors normally precede what they describe.

They do so a bit more frequently on average, but the other order isn't so unusual, either. The word order isn't the determining factor here. What makes it clear that quattuor doesn't go with Romani is that quattuor is the only thing that can be the direct object of iunxerunt. You're right here:

It might be the accusative if used substantively.

It is.

Also, John: look at the number of urbibus, and the case and number of eius.

Prima via is an ablative of means.