If this army represents an army of an allied/client city state, yes, but then it wouldn't really be led by a Roman general I guess, and the Romans would be rather cautious or very proud to allow such an army to enter their territory unsupervised or fight their battles for them. And it is possible the leader of the allied force would simply not wish to take the risk to help Rome, if they were losing that badly.
The point: if you do raise such an army, it isn't essentially yours (in roleplaying terms), it is an allied one and can act as it chooses in any given situation.
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