I was messing around with the Trajan (spelling?) Parthia scenario and managed to get Trajans expedition deep into Mesopotamia. We were crushing all opposition then had a big battle that wrecked all 3 legions. My question is if I return to a big base such as Antioch will these legions rebuild or are the destroyed units lost forever?
Also is it better to build a string of depots from each location to keep supply moving? I know it's harsh desert terrain but my armies that pushed next to Trajan's force started to run out of supplies half way to Mesopotamia.