Legion replacement system

[John M McDermott]

However, the history of the late Republic shows that Caesar had problems with the 8th, 9th and 10th Legions that would not campaign with him after Pharsalus, and, instead clamored for their discharges, en masse.

I also think that it is a leap of faith to assume that veterans would have been distributed throughout the army.

Also, by the time of the late Republic, legions seem to have been raised locally, that is, from the same area. Some legions were referred to as "Spanish" legions.